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MCQ (Single Correct Answer)

1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Choke coil is simply a coil having a large inductance but a small resistance. Choke coils are used with fluorescent mercury-tube fittings. If household electric power is directly connected to a mercury tube, the tube will be damaged.

Reason (R): By using the choke coil, the voltage across the tube is reduced by a factor $\left(R / \sqrt{R^2+\omega^2 L^2}\right)$, where $\omega$ is frequency of the supply across resistor $R$ and inductor $L$. If the choke coil were not used, the voltage across the resistor would be the same as the applied voltage.

In the light of the above statements, choose the most appropriate answer from the options given below :

JEE Main 2025 (Online) 29th January Morning Shift
2
JEE Main 2025 (Online) 28th January Evening Shift Physics - Current Electricity Question 9 English

In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage $ V_{AB} $ is correctly represented by:

JEE Main 2025 (Online) 28th January Evening Shift
3

Find the equivalent resistance between two ends of the following circuit

JEE Main 2025 (Online) 28th January Morning Shift Physics - Current Electricity Question 2 English

JEE Main 2025 (Online) 28th January Morning Shift
4

A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into $a$ square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is

JEE Main 2025 (Online) 28th January Morning Shift
5

A galvanometer having a coil of resistance $30 \Omega$ need 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer should be $\frac{30}{X} \Omega$, where $X$ is

JEE Main 2025 (Online) 23rd January Evening Shift
6

Consider a moving coil galvanomenter (MCG):

A. The torsional constant in moving coil galvanometer has dimentions $\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]$

B. Increasing the current sensitivity may not necessarily increase the voltage sensitivity.

C. If we increase number of turns $(\mathrm{N})$ to its double $(2 \mathrm{~N})$, then the voltage sensitivity doubles.

D. MCG can be converted into an ammeter by introducing a shunt resistance of large value in parallel with galvanometer.

E. Current sensitivity of MCG depends inversely on number of turns of coil.

Choose the correct answer from the options given below:

JEE Main 2025 (Online) 23rd January Morning Shift
7

Given below are two statements :

Statement-I : The equivalent emf of two nonideal batteries connected in parallel is smaller than either of the two emfs.

Statement-II : The equivalent internal resistance of two nonideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries.

In the light of the above statements, choose the correct answer from the options given below.

JEE Main 2025 (Online) 22nd January Morning Shift
8

Which of the following resistivity ( $\rho$ ) $\mathrm{v} / \mathrm{s}$ temperature ( T ) curves is most suitable to be used in wire bound standard resistors?

JEE Main 2025 (Online) 22nd January Morning Shift
9

JEE Main 2025 (Online) 22nd January Morning Shift Physics - Current Electricity Question 10 English

Sliding contact of a potentiometer is in the middle of the potentiometer wire having resistance $R_p=1 \Omega$ as shown in the figure. An external resistance of $R_e=2 \Omega$ is connected via the sliding contact. The electric current in the circuit is :

JEE Main 2025 (Online) 22nd January Morning Shift
10

The effective resistance between $$A$$ and $$B$$, if resistance of each resistor is $$R$$, will be :

JEE Main 2024 (Online) 9th April Evening Shift Physics - Current Electricity Question 33 English

JEE Main 2024 (Online) 9th April Evening Shift
11

A galvanometer has a coil of resistance $$200 \Omega$$ with a full scale deflection at $$20 \mu \mathrm{A}$$. The value of resistance to be added to use it as an ammeter of range $$(0-20) \mathrm{mA}$$ is :

JEE Main 2024 (Online) 9th April Morning Shift
12

The equivalent resistance between A and B is :

JEE Main 2024 (Online) 9th April Morning Shift Physics - Current Electricity Question 31 English

JEE Main 2024 (Online) 9th April Morning Shift
13

Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be _________ to __________ times of its initial length if the water is to be boiled in 15 minutes.

JEE Main 2024 (Online) 8th April Evening Shift
14

In the given circuit, the terminal potential difference of the cell is :

JEE Main 2024 (Online) 8th April Morning Shift Physics - Current Electricity Question 22 English

JEE Main 2024 (Online) 8th April Morning Shift
15

The number of electrons flowing per second in the filament of a $$110 \mathrm{~W}$$ bulb operating at $$220 \mathrm{~V}$$ is : (Given $$\mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$$)

JEE Main 2024 (Online) 6th April Evening Shift
16

The value of unknown resistance $$(x)$$ for which the potential difference between $$B$$ and $$D$$ will be zero in the arrangement shown, is :

JEE Main 2024 (Online) 6th April Morning Shift Physics - Current Electricity Question 13 English

JEE Main 2024 (Online) 6th April Morning Shift
17

The ratio of heat dissipated per second through the resistance $$5 \Omega$$ and $$10 \Omega$$ in the circuit given below is:

JEE Main 2024 (Online) 5th April Evening Shift Physics - Current Electricity Question 17 English

JEE Main 2024 (Online) 5th April Evening Shift
18

A galvanometer of resistance $$100 \Omega$$ when connected in series with $$400 \Omega$$ measures a voltage of upto $$10 \mathrm{~V}$$. The value of resistance required to convert the galvanometer into ammeter to read upto $$10 \mathrm{~A}$$ is $$x \times 10^{-2} \Omega$$. The value of $$x$$ is :

JEE Main 2024 (Online) 5th April Evening Shift
19

In the given figure $$\mathrm{R}_1=10 \Omega, \mathrm{R}_2=8 \Omega, \mathrm{R}_3=4 \Omega$$ and $$\mathrm{R}_4=8 \Omega$$. Battery is ideal with emf $$12 \mathrm{~V}$$. Equivalent resistant of the circuit and current supplied by battery are respectively :

JEE Main 2024 (Online) 5th April Morning Shift Physics - Current Electricity Question 20 English

JEE Main 2024 (Online) 5th April Morning Shift
20

An electric bulb rated $$50 \mathrm{~W}-200 \mathrm{~V}$$ is connected across a $$100 \mathrm{~V}$$ supply. The power dissipation of the bulb is:

JEE Main 2024 (Online) 4th April Evening Shift
21

To measure the internal resistance of a battery, potentiometer is used. For $$R=10 \Omega$$, the balance point is observed at $$l=500 \mathrm{~cm}$$ and for $$\mathrm{R}=1 \Omega$$ the balance point is observed at $$l=400 \mathrm{~cm}$$. The internal resistance of the battery is approximately :

JEE Main 2024 (Online) 4th April Morning Shift
22
In a metre-bridge when a resistance in the left gap is $2 \Omega$ and unknown resistance in the right gap, the balance length is found to be $40 \mathrm{~cm}$. On shunting the unknown resistance with $2 \Omega$, the balance length changes by :
JEE Main 2024 (Online) 1st February Evening Shift
23
In an ammeter, $5 \%$ of the main current passes through the galvanometer. If resistance of the galvanometer is $\mathrm{G}$, the resistance of ammeter will be :
JEE Main 2024 (Online) 1st February Evening Shift
24
The reading in the ideal voltmeter $(\mathrm{V})$ shown in the given circuit diagram is :

JEE Main 2024 (Online) 1st February Morning Shift Physics - Current Electricity Question 58 English
JEE Main 2024 (Online) 1st February Morning Shift
25
A galvanometer has a resistance of $50 ~\Omega$ and it allows maximum current of $5 \mathrm{~mA}$. It can be converted into voltmeter to measure upto $100 \mathrm{~V}$ by connecting in series a resistor of resistance :
JEE Main 2024 (Online) 1st February Morning Shift
26

By what percentage will the illumination of the lamp decrease if the current drops by 20%?

JEE Main 2024 (Online) 31st January Evening Shift
27

The resistance per centimeter of a meter bridge wire is $$r$$, with $$X \Omega$$ resistance in left gap. Balancing length from left end is at $$40 \mathrm{~cm}$$ with $$25 \Omega$$ resistance in right gap. Now the wire is replaced by another wire of $$2 r$$ resistance per centimeter. The new balancing length for same settings will be at

JEE Main 2024 (Online) 31st January Evening Shift
28

Two conductors have the same resistances at $$0^{\circ} \mathrm{C}$$ but their temperature coefficients of resistance are $$\alpha_1$$ and $$\alpha_2$$. The respective temperature coefficients for their series and parallel combinations are :

JEE Main 2024 (Online) 31st January Morning Shift
29

When a potential difference $$V$$ is applied across a wire of resistance $$R$$, it dissipates energy at a rate $$W$$. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:

JEE Main 2024 (Online) 30th January Evening Shift
30

A potential divider circuit is shown in figure. The output voltage V$$_0$$ is :

JEE Main 2024 (Online) 30th January Morning Shift Physics - Current Electricity Question 38 English

JEE Main 2024 (Online) 30th January Morning Shift
31

An electric toaster has resistance of $$60 \Omega$$ at room temperature $$\left(27^{\circ} \mathrm{C}\right)$$. The toaster is connected to a $$220 \mathrm{~V}$$ supply. If the current flowing through it reaches $$2.75 \mathrm{~A}$$, the temperature attained by toaster is around : ( if $$\alpha=2 \times 10^{-4}$$/$$^\circ \mathrm{C}$$)

JEE Main 2024 (Online) 30th January Morning Shift
32

In the given circuit, the current in resistance R$$_3$$ is :

JEE Main 2024 (Online) 29th January Evening Shift Physics - Current Electricity Question 42 English

JEE Main 2024 (Online) 29th January Evening Shift
33

The deflection in moving coil galvanometer falls from 25 divisions to 5 division when a shunt of $$24 \Omega$$ is applied. The resistance of galvanometer coil will be :

JEE Main 2024 (Online) 29th January Morning Shift
34

A galvanometer having coil resistance $$10 \Omega$$ shows a full scale deflection for a current of $$3 \mathrm{~mA}$$. For it to measure a current of $$8 \mathrm{~A}$$, the value of the shunt should be:

JEE Main 2024 (Online) 29th January Morning Shift
35

The electric current through a wire varies with time as $$I=I_0+\beta t$$, where $$I_0=20 \mathrm{~A}$$ and $$\beta=3 \mathrm{~A} / \mathrm{s}$$. The amount of electric charge crossed through a section of the wire in $$20 \mathrm{~s}$$ is :

JEE Main 2024 (Online) 29th January Morning Shift
36

Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across $$A$$ and $$B$$, their readings are $$V_1, V_2$$ and $$V_3$$. Choose the correct option.

JEE Main 2024 (Online) 27th January Evening Shift Physics - Current Electricity Question 53 English

JEE Main 2024 (Online) 27th January Evening Shift
37

A current of $$200 \mu \mathrm{A}$$ deflects the coil of a moving coil galvanometer through $$60^{\circ}$$. The current to cause deflection through $$\frac{\pi}{10}$$ radian is :

JEE Main 2024 (Online) 27th January Evening Shift
38

Wheatstone bridge principle is used to measure the specific resistance $$\left(S_1\right)$$ of given wire, having length $$L$$, radius $$r$$. If $$X$$ is the resistance of wire, then specific resistance is ; $$S_1=X\left(\frac{\pi r^2}{L}\right)$$. If the length of the wire gets doubled then the value of specific resistance will be :

JEE Main 2024 (Online) 27th January Evening Shift
39

A wire of length $$10 \mathrm{~cm}$$ and radius $$\sqrt{7} \times 10^{-4} \mathrm{~m}$$ connected across the right gap of a meter bridge. When a resistance of $$4.5 \Omega$$ is connected on the left gap by using a resistance box, the balance length is found to be at $$60 \mathrm{~cm}$$ from the left end. If the resistivity of the wire is $$\mathrm{R} \times 10^{-7} \Omega \mathrm{m}$$, then value of $$\mathrm{R}$$ is :

JEE Main 2024 (Online) 27th January Morning Shift
40

A wire of resistance $$\mathrm{R}$$ and length $$\mathrm{L}$$ is cut into 5 equal parts. If these parts are joined parallely, then resultant resistance will be :

JEE Main 2024 (Online) 27th January Morning Shift
41
For designing a voltmeter of range $50 \mathrm{~V}$ and an ammeter of range $10 \mathrm{~mA}$ using a galvanometer which has a coil of resistance $54 \Omega$ showing a full scale deflection for $1 \mathrm{~mA}$ as in figure.

JEE Main 2023 (Online) 15th April Morning Shift Physics - Current Electricity Question 83 English

(A) for voltmeter $R \approx 50 \mathrm{k} \Omega$

(B) for ammeter $\mathrm{r} \approx 0.2 \Omega$

(C) for ammeter $\mathrm{r}=6 \Omega$

(D) for voltmeter $R \approx 5 \mathrm{k} \Omega$

(E) for voltmeter $R \approx 500 \Omega$

Choose the correct answer from the options given below:
JEE Main 2023 (Online) 15th April Morning Shift
42
Given below are two statements:

Statement I : The equivalent resistance of resistors in a series combination is smaller than least resistance used in the combination.

Statement II : The resistivity of the material is independent of temperature.

In the light of the above statements, choose the correct answer from the options given below :
JEE Main 2023 (Online) 15th April Morning Shift
43

Different combination of 3 resistors of equal resistance $$\mathrm{R}$$ are shown in the figures. The increasing order for power dissipation is:

JEE Main 2023 (Online) 13th April Morning Shift Physics - Current Electricity Question 80 English

JEE Main 2023 (Online) 13th April Morning Shift
44

A wire of resistance $$160 ~\Omega$$ is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will be

JEE Main 2023 (Online) 12th April Morning Shift
45

JEE Main 2023 (Online) 11th April Evening Shift Physics - Current Electricity Question 75 English

The current flowing through R$$_2$$ is :

JEE Main 2023 (Online) 11th April Evening Shift
46

Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:

JEE Main 2023 (Online) 11th April Morning Shift
47

The current sensitivity of moving coil galvanometer is increased by $$25 \%$$. This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

JEE Main 2023 (Online) 11th April Morning Shift
48

The equivalent resistance of the circuit shown below between points a and b is :

JEE Main 2023 (Online) 10th April Morning Shift Physics - Current Electricity Question 69 English

JEE Main 2023 (Online) 10th April Morning Shift
49

The equivalent resistance between A and B as shown in figure is:

JEE Main 2023 (Online) 8th April Evening Shift Physics - Current Electricity Question 67 English

JEE Main 2023 (Online) 8th April Evening Shift
50

Figure shows a part of an electric circuit. The potentials at points $$a, b$$ and $$c$$ are $$30 \mathrm{~V}, 12 \mathrm{~V}$$ and $$2 \mathrm{~V}$$ respectively. The current through the $$20 ~\Omega$$ resistor will be,

JEE Main 2023 (Online) 6th April Evening Shift Physics - Current Electricity Question 63 English

JEE Main 2023 (Online) 6th April Evening Shift
51

A student is provided with a variable voltage source $$\mathrm{V}$$, a test resistor $$R_{T}=10 ~\Omega$$, two identical galvanometers $$G_{1}$$ and $$G_{2}$$ and two additional resistors, $$R_{1}=10 ~M \Omega$$ and $$R_{2}=0.001 ~\Omega$$. For conducting an experiment to verify ohm's law, the most suitable circuit is:

JEE Main 2023 (Online) 6th April Evening Shift
52

Given below are two statements : One is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A : For measuring the potential difference across a resistance of $$600 \Omega$$, the voltmeter with resistance $$1000 \Omega$$ will be preferred over voltmeter with resistance $$4000 \Omega$$.

Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance.

In the light of the above statements, choose the most appropriate answer from the options given below.

JEE Main 2023 (Online) 1st February Evening Shift
53

Equivalent resistance between the adjacent corners of a regular n-sided polygon of uniform wire of resistance R would be :

JEE Main 2023 (Online) 1st February Evening Shift
54

The equivalent resistance between $$A$$ and $$B$$ of the network shown in figure;

JEE Main 2023 (Online) 1st February Morning Shift Physics - Current Electricity Question 104 English

JEE Main 2023 (Online) 1st February Morning Shift
55
The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50 \%$. The percentage change in voltage sensitivity of the galvanometer will be :
JEE Main 2023 (Online) 31st January Evening Shift
56
The $\mathrm{H}$ amount of thermal energy is developed by a resistor in $10 \mathrm{~s}$ when a current of $4 \mathrm{~A}$ is passed through it. If the current is increased to $16 \mathrm{~A}$, the thermal energy developed by the resistor in $10 \mathrm{~s}$ will be :
JEE Main 2023 (Online) 31st January Evening Shift
57

The drift velocity of electrons for a conductor connected in an electrical circuit is $$\mathrm{V}_{\mathrm{d}}$$. The conductor in now replaced by another conductor with same material and same length but double the area of cross section. The applied voltage remains same. The new drift velocity of electrons will be

JEE Main 2023 (Online) 31st January Morning Shift
58
The equivalent resistance between $A$ and $B$ is _________.

JEE Main 2023 (Online) 30th January Evening Shift Physics - Current Electricity Question 100 English
JEE Main 2023 (Online) 30th January Evening Shift
59

The charge flowing in a conductor changes with time as $$\mathrm{Q}(\mathrm{t})=\alpha \mathrm{t}-\beta \mathrm{t}^{2}+\gamma \mathrm{t}^{3}$$. Where $$\alpha, \beta$$ and $$\gamma$$ are constants. Minimum value of current is :

JEE Main 2023 (Online) 30th January Morning Shift
60

With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is

(A) directly proportional to the length of the potentiometer wire

(B) directly proportional to the potential gradient of the wire

(C) inversely proportional to the potential gradient of the wire

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements :

JEE Main 2023 (Online) 29th January Evening Shift
61

Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is :

JEE Main 2023 (Online) 29th January Morning Shift
62

The resistance of a wire is 5 $$\Omega$$. It's new resistance in ohm if stretched to 5 times of it's original length will be :

JEE Main 2023 (Online) 25th January Evening Shift
63

A uniform metallic wire carries a current 2 A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is 8.92 $$\times$$ 10$$^{-3}$$ kg, density is 8.92 $$\times$$ 10$$^{3}$$ kg/m$$^3$$ and resistivity is 1.7 $$\times$$ 10$$^{-8}~\Omega$$-$$\mathrm{m}$$. The length of wire is :

JEE Main 2023 (Online) 25th January Morning Shift
64

A cell of emf 90 V is connected across series combination of two resistors each of 100$$\Omega$$ resistance. A voltmeter of resistance 400$$\Omega$$ is used to measure the potential difference across each resistor. The reading of the voltmeter will be :

JEE Main 2023 (Online) 24th January Evening Shift
65

As shown in the figure, a network of resistors is connected to a battery of 24V with an internal resistance of 3 $$\Omega$$. The currents through the resistors R$$_4$$ and R$$_5$$ are I$$_4$$ and I$$_5$$ respectively. The values of I$$_4$$ and I$$_5$$ are :

JEE Main 2023 (Online) 24th January Morning Shift Physics - Current Electricity Question 85 English

JEE Main 2023 (Online) 24th January Morning Shift
66

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.

Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.

In the light of the above statements, choose the correct answer from the options given below.

JEE Main 2022 (Online) 29th July Evening Shift
67

A $$1 \mathrm{~m}$$ long wire is broken into two unequal parts $$\mathrm{X}$$ and $$\mathrm{Y}$$. The $$\mathrm{X}$$ part of the wire is streched into another wire W. Length of $$W$$ is twice the length of $$X$$ and the resistance of $$\mathrm{W}$$ is twice that of $$\mathrm{Y}$$. Find the ratio of length of $$\mathrm{X}$$ and $$\mathrm{Y}$$.

JEE Main 2022 (Online) 29th July Evening Shift
68

Two metallic wires of identical dimensions are connected in series. If $$\sigma_{1}$$ and $$\sigma_{2}$$ are the conductivities of the these wires respectively, the effective conductivity of the combination is :

JEE Main 2022 (Online) 29th July Morning Shift
69

Given below are two statements :

Statement I : A uniform wire of resistance $$80 \,\Omega$$ is cut into four equal parts. These parts are now connected in parallel. The equivalent resistance of the combination will be $$5 \,\Omega$$.

Statement II: Two resistances 2R and 3R are connected in parallel in a electric circuit. The value of thermal energy developed in 3R and 2R will be in the ratio $$3: 2$$.

In the light of the above statements, choose the most appropriate answer from the option given below

JEE Main 2022 (Online) 28th July Evening Shift
70

A wire of resistance R1 is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to original resistance is :

JEE Main 2022 (Online) 28th July Morning Shift
71

(A) The drift velocity of electrons decreases with the increase in the temperature of conductor.

(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.

(C) The drift velocity does not depend on the applied potential difference to the conductor.

(D) The drift velocity of electron is inversely proportional to the length of the conductor.

(E) The drift velocity increases with the increase in the temperature of conductor.

Choose the correct answer from the options given below :

JEE Main 2022 (Online) 27th July Evening Shift
72

Two sources of equal emfs are connected in series. This combination is connected to an external resistance R. The internal resistances of the two sources are $$r_{1}$$ and $$r_{2}$$ $$\left(r_{1}>r_{2}\right)$$. If the potential difference across the source of internal resistance $$r_{1}$$ is zero, then the value of R will be :

JEE Main 2022 (Online) 27th July Morning Shift
73

A battery of $$6 \mathrm{~V}$$ is connected to the circuit as shown below. The current I drawn from the battery is :

JEE Main 2022 (Online) 26th July Evening Shift Physics - Current Electricity Question 123 English

JEE Main 2022 (Online) 26th July Evening Shift
74

The current I in the given circuit will be :

JEE Main 2022 (Online) 26th July Morning Shift Physics - Current Electricity Question 125 English

JEE Main 2022 (Online) 26th July Morning Shift
75

A current of 15 mA flows in the circuit as shown in figure. The value of potential difference between the points A and B will be:

JEE Main 2022 (Online) 25th July Evening Shift Physics - Current Electricity Question 128 English

JEE Main 2022 (Online) 25th July Evening Shift
76

Which of the following physical quantities have the same dimensions?

JEE Main 2022 (Online) 25th July Morning Shift
77

An electric cable of copper has just one wire of radius 9 mm. Its resistance is 14 $$\Omega$$. If this single copper wire of the cable is replaced by seven identical well insulated copper wires each of radius 3 mm connected in parallel, then the new resistance of the combination will be :

JEE Main 2022 (Online) 30th June Morning Shift
78

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2$$\Omega$$. The value of internal resistance of each cell is

JEE Main 2022 (Online) 29th June Evening Shift
79

Resistance of the wire is measured as 2 $$\Omega$$ and 3 $$\Omega$$ at 10$$^\circ$$C and 30$$^\circ$$C respectively. Temperature co-efficient of resistance of the material of the wire is :

JEE Main 2022 (Online) 28th June Evening Shift
80

A 72 $$\Omega$$ galvanometer is shunted by a resistance of 8 $$\Omega$$. The percentage of the total current which passes through the galvanometer is :

JEE Main 2022 (Online) 27th June Morning Shift
81

The equivalent resistance between points A and B in the given network is :

JEE Main 2022 (Online) 26th June Evening Shift Physics - Current Electricity Question 145 English

JEE Main 2022 (Online) 26th June Evening Shift
82

An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in resistance is :

JEE Main 2022 (Online) 26th June Morning Shift
83

Two cells of same emf but different internal resistances r1 and r2 are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is :

JEE Main 2022 (Online) 25th June Evening Shift
84

If n represents the actual number of deflections in a converted galvanometer of resistance G and shunt resistance S. Then the total current I when its figure of merit is K will be:

JEE Main 2022 (Online) 25th June Evening Shift
85

A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for $${1 \over 3}$$ deflection in the galvanometer. Which of the below is true for measuring value of G?

JEE Main 2022 (Online) 25th June Morning Shift
86

What will be the most suitable combination of three resistors A = 2$$\Omega$$, B = 4$$\Omega$$, C = 6$$\Omega$$ so that $$\left( {{{22} \over 3}} \right)$$$$\Omega$$ is equivalent resistance of combination?

JEE Main 2022 (Online) 24th June Evening Shift
87

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $$\Omega$$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

JEE Main 2022 (Online) 24th June Morning Shift
88
Due to cold weather a 1 m water pipe of cross-sectional area 1 cm2 is filled with ice at $$-$$10$$^\circ$$C. Resistive heating is used to melt the ice. Current of 0.5A is passed through 4 k$$\Omega$$ resistance. Assuming that all the heat produced is used for melting, what is the minimum time required? (Given latent heat of fusion for water/ice = 3.33 $$\times$$ 105 J kg$$-$$1, specific heat of ice = 2 $$\times$$ 103 J kg$$-$$1 and density of ice = 103 kg/m3
JEE Main 2021 (Online) 1st September Evening Shift
89
Two resistors R1 = (4 $$\pm$$ 0.8) $$\Omega$$ and R2 = (4 $$\pm$$ 0.4) $$\Omega$$ are connected in parallel. The equivalent resistance of their parallel combination will be :
JEE Main 2021 (Online) 1st September Evening Shift
90
The equivalent resistance of the given circuit between the terminals A and B is :

JEE Main 2021 (Online) 31st August Evening Shift Physics - Current Electricity Question 159 English
JEE Main 2021 (Online) 31st August Evening Shift
91
Consider a galvanometer shunted with 5$$\Omega$$ resistance and 2% of current passes through it. What is the resistance of the given galvanometer ?
JEE Main 2021 (Online) 31st August Morning Shift
92
The Colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is :

JEE Main 2021 (Online) 27th August Evening Shift Physics - Current Electricity Question 169 English
JEE Main 2021 (Online) 27th August Evening Shift
93
For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :
JEE Main 2021 (Online) 27th August Evening Shift
94
Five identical cells each of internal resistance 1$$\Omega$$ and emf 5V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same?
JEE Main 2021 (Online) 27th August Morning Shift
95
If you are provided a set of resistances 2$$\Omega$$, 4$$\Omega$$, 6$$\Omega$$ and 8$$\Omega$$. Connect these resistances so as to obtain an equivalent resistance of $${{46} \over 3}$$$$\Omega$$.
JEE Main 2021 (Online) 26th August Evening Shift
96
An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is 500 W.
JEE Main 2021 (Online) 26th August Evening Shift
97
In the given figure, the emf of the cell is 2.2 V and if internal resistance is 0.6$$\Omega$$. Calculate the power dissipated in the whole circuit :
JEE Main 2021 (Online) 26th August Morning Shift Physics - Current Electricity Question 174 English
JEE Main 2021 (Online) 26th August Morning Shift
98
What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of 3$$\Omega$$ ?

(Given resistivities of iron and copper-nickel alloy wire are 12 $$\mu$$$$\Omega$$ and 51 $$\mu$$$$\Omega$$ cm respectively)
JEE Main 2021 (Online) 26th August Morning Shift
99
The resistance of a conductor at 15$$^\circ$$C is 16$$\Omega$$ and at 100$$^\circ$$C is 20$$\Omega$$. What will be the temperature coefficient of resistance of the conductor?
JEE Main 2021 (Online) 27th July Evening Shift
100
In the given figure, a battery of emf E is connected across a conductor PQ of length 'l' and different area of cross-sections having radii r1 and r2 (r2 < r1).

JEE Main 2021 (Online) 27th July Morning Shift Physics - Current Electricity Question 178 English
Choose the correct option as one moves from P to Q :
JEE Main 2021 (Online) 27th July Morning Shift
101
In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm. The ratio of the emf of two cells, $${{{\varepsilon _1}} \over {{\varepsilon _2}}}$$ is :

JEE Main 2021 (Online) 25th July Evening Shift Physics - Current Electricity Question 179 English
JEE Main 2021 (Online) 25th July Evening Shift
102
The given potentiometer has its wire of resistance 10$$\Omega$$. When the sliding contact is in the middle of the potentiometer wire, the potential drop across 2$$\Omega$$ resistor is :

JEE Main 2021 (Online) 25th July Evening Shift Physics - Current Electricity Question 180 English
JEE Main 2021 (Online) 25th July Evening Shift
103
In the given figure, there is a circuit of potentiometer of length AB = 10 m. The resistance per unit length is 0.1 $$\Omega$$ per cm. Across AB, a battery of emf E and internal resistance 'r' is connected. The maximum value of emf measured by this potentiometer is :

JEE Main 2021 (Online) 25th July Morning Shift Physics - Current Electricity Question 182 English
JEE Main 2021 (Online) 25th July Morning Shift
104
A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.

(Take Resistivity of Copper = 1.7 $$\times$$ 10$$-$$8 $$\Omega$$m and Resistivity of Aluminium = 2.6 $$\times$$ 10$$-$$8 $$\Omega$$m)

JEE Main 2021 (Online) 22th July Evening Shift Physics - Current Electricity Question 184 English
JEE Main 2021 (Online) 22th July Evening Shift
105
A current of 5 A is passing through a non-linear magnesium wire of cross-section 0.04 m2. At every point the direction of current density is at an angle of 60$$^\circ$$ with the unit vector of area of cross-section. The magnitude of electric field at every point of the conductor is :

(Resistivity of magnesium $$\rho$$ = 44 $$\times$$ 10$$-$$8 $$\Omega$$m)
JEE Main 2021 (Online) 20th July Morning Shift
106
JEE Main 2021 (Online) 20th July Morning Shift Physics - Current Electricity Question 187 English
The value of current in the 6 $$\Omega$$ resistance is :
JEE Main 2021 (Online) 20th July Morning Shift
107
In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is :
JEE Main 2021 (Online) 18th March Morning Shift
108
Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

JEE Main 2021 (Online) 17th March Evening Shift Physics - Current Electricity Question 193 English
JEE Main 2021 (Online) 17th March Evening Shift
109
The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15$$\Omega$$ resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10V is maintained across AC.

JEE Main 2021 (Online) 17th March Evening Shift Physics - Current Electricity Question 194 English
JEE Main 2021 (Online) 17th March Evening Shift
110
A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 $$\times$$ 10$$-$$3 ms$$-$$1. The number of free electrons in each cubic meter of the wire is ___________.
JEE Main 2021 (Online) 17th March Morning Shift
111
A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5A to 3A, what will be the energy developed in 20 s.
JEE Main 2021 (Online) 16th March Evening Shift
112
A conducting wire of length 'l', area of cross-section A and electric resistivity $$\rho$$ is connected between the terminals of a battery. A potential difference V is developed between its ends, causing an electric current.

If the length of the wire of the same material is doubled and the area of cross-section is halved, the resultant current would be :
JEE Main 2021 (Online) 16th March Morning Shift
113
A wire of 1$$\Omega$$ has a length of 1 m. It is stretched till its length increases by 25%. The percentage change in resistance to the nearest integer is :
JEE Main 2021 (Online) 26th February Evening Shift
114
Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :

JEE Main 2021 (Online) 26th February Morning Shift Physics - Current Electricity Question 203 English
JEE Main 2021 (Online) 26th February Morning Shift
115
A current through a wire depends on time as

i = $$\alpha$$0t + $$\beta$$t2

where $$\alpha$$0 = 20 A/s and $$\beta$$ = 8 As$$-$$2. Find the charge crossed through a section of the wire in 15 s.
JEE Main 2021 (Online) 24th February Morning Shift
116
A cell E1 of emf 6V and internal resistance 2$$\Omega$$ is connected with another cell E2 of emf 4V and internal resistance 8$$\Omega$$ (as shown in the figure). The potential difference across points X and Y is :

JEE Main 2021 (Online) 24th February Morning Shift Physics - Current Electricity Question 207 English
JEE Main 2021 (Online) 24th February Morning Shift
117
A circuit to verify Ohm's law uses ammeter and voltmeter in series or parallel connected correctly to the resistor. In the circuit :
JEE Main 2020 (Online) 6th September Evening Slot
118
In the figure shown, the current in the 10 V battery is close to : JEE Main 2020 (Online) 6th September Evening Slot Physics - Current Electricity Question 209 English
JEE Main 2020 (Online) 6th September Evening Slot
119
In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point B with respect to the point A is : JEE Main 2020 (Online) 5th September Evening Slot Physics - Current Electricity Question 212 English
JEE Main 2020 (Online) 5th September Evening Slot
120
A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6 mA it produces a deflection of 2o, its figure of merit is close to :
JEE Main 2020 (Online) 5th September Evening Slot
121
An electrical power line, having a total resistance of 2 $$\Omega $$, delivers 1 kW at 220 V. The efficiency of the transmission line is approximately :
JEE Main 2020 (Online) 5th September Morning Slot
122
A galvanometer of resistance G is converted into a voltmeter of range 0 – 1 V by connecting a resistance R1 in series with it. The additional resistance that should be connected in series with R1 to increase the range of the voltmeter to 0 – 2 V will be :
JEE Main 2020 (Online) 5th September Morning Slot
123
The value of current i1 flowing from A to C in the circuit diagram is : JEE Main 2020 (Online) 4th September Evening Slot Physics - Current Electricity Question 216 English
JEE Main 2020 (Online) 4th September Evening Slot
124
A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V, the power dissipated within the internal resistance is :
JEE Main 2020 (Online) 4th September Morning Slot
125
Two resistors 400$$\Omega $$ and 800$$\Omega $$ are connected in series across a 6 V battery. The potential difference measured by a voltmeter of 10 k$$\Omega $$ across 400 $$\Omega $$ resistor is close to :
JEE Main 2020 (Online) 3rd September Evening Slot
126
Model a torch battery of length $$l$$ to be made up of a thin cylindrical bar of radius ‘a’ and a concentric thin cylindrical shell of radius ‘b’ filled in between with an electrolyte of resistivity $$\rho $$ (see figure). If the battery is connected to a resistance of value R, the maximum Joule heating in R will take place for : JEE Main 2020 (Online) 3rd September Morning Slot Physics - Current Electricity Question 218 English
JEE Main 2020 (Online) 3rd September Morning Slot
127
A potentiometer wire PQ of 1 m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance ‘r’ and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm from Q. The potential gradient in the potentiometer wire is : JEE Main 2020 (Online) 2nd September Evening Slot Physics - Current Electricity Question 219 English
JEE Main 2020 (Online) 2nd September Evening Slot
128
Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity $$\rho $$C, $$\rho $$T, $$\rho $$M and $$\rho $$A respectively. Then :
JEE Main 2020 (Online) 2nd September Morning Slot
129
In the given circuit diagram, a wire is joining points B and D. The current in this wire is : JEE Main 2020 (Online) 9th January Morning Slot Physics - Current Electricity Question 223 English
JEE Main 2020 (Online) 9th January Morning Slot
130
A galvanometer having a coil resistance 100 $$\Omega $$ gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?
JEE Main 2020 (Online) 8th January Evening Slot
131
The length of a potentiometer wire is 1200 cm and it carries a current of 60 mA. For a cell of emf 5V and internal resistance of 20$$\Omega $$, the null point on it is found to be a 1000 cm. The resistance of whole wire is :
JEE Main 2020 (Online) 8th January Morning Slot
132
In a building there are 15 bulbs of 45 W, 15 bulbs of 100 W, 15 small fans of 10 W and 2 heaters of 1 kW. The voltage of electric main is 220 V. The minimum fuse capacity (rated value) of the building will be :
JEE Main 2020 (Online) 7th January Evening Slot
133
The current I1 (in A) flowing through 1 $$\Omega $$ resistor in the following circuit is : JEE Main 2020 (Online) 7th January Morning Slot Physics - Current Electricity Question 230 English
JEE Main 2020 (Online) 7th January Morning Slot
134
A moving coil galvanometer, having a resistance G, produces full scale deflection when a current Ig flows through it. This galvanometer can be converted into (i) an ammeter of range 0 to I0(I0 > Ig) by connecting a shunt resistance RA to it and (ii) into a voltmeter of range 0 to V (V = GI0) by connecting a series resistance RV to it. Then,
JEE Main 2019 (Online) 12th April Evening Slot
135
The resistive network shown below is connected to a D.C. source of 16 V. The power consumed by the network is 4 Watt. The value of R is: JEE Main 2019 (Online) 12th April Morning Slot Physics - Current Electricity Question 234 English
JEE Main 2019 (Online) 12th April Morning Slot
136
A galvanometer of resistance 100 $$\Omega $$ has 50 divisions on its scale and has sensitivitv of 20 $$\mu $$A/division. It is to be converted to a voltmeter with three ranges of 0-2V, 0-10 V and 0-20 V. The appropriate circuit to do so is
JEE Main 2019 (Online) 12th April Morning Slot
137
To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained : JEE Main 2019 (Online) 12th April Morning Slot Physics - Current Electricity Question 232 English
If V0 is almost zero, identify the correct statement :
JEE Main 2019 (Online) 12th April Morning Slot
138
Space between two concentric conducting spheres of radii a and b (b > a) is filled with a medium of resistivity $$\rho $$. The resistance between the two spheres will be :
JEE Main 2019 (Online) 10th April Evening Slot
139
A current of 5 A passes through a copper conductor (resistivity = 1.7 × 10–8 $$\Omega $$m) of radius of cross-section 5 mm. Find the mobility of the charges if their drift velocity is 1.1 × 10–3 m/s.
JEE Main 2019 (Online) 10th April Morning Slot
140
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure JEE Main 2019 (Online) 10th April Morning Slot Physics - Current Electricity Question 239 English
SI. No. R($$\Omega $$) l(cm)
1. 1000 60
2. 100 13
3. 10 1.5
4. 1 1.0
Which of the readings is inconsistent?
JEE Main 2019 (Online) 10th April Morning Slot
141
In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. One may conclude that : JEE Main 2019 (Online) 10th April Morning Slot Physics - Current Electricity Question 238 English
JEE Main 2019 (Online) 10th April Morning Slot
142
A moving coil galvanometer allows a full scale current of 10–4 A. A series resistance of 2 M$$\Omega $$ is required to convert the above galvanometer into a voltmeter of range 0-5 V. Therefore the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0.10 mA is :
JEE Main 2019 (Online) 10th April Morning Slot
143
In the given circuit, an ideal voltmeter connected across the 10$$\Omega $$ resistance reads 2V. The internal resistance r, of each cell is: JEE Main 2019 (Online) 10th April Morning Slot Physics - Current Electricity Question 236 English
JEE Main 2019 (Online) 10th April Morning Slot
144
A metal wire of resistance 3 $$\Omega $$ is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60° at the centre, the equivalent resistance between these two points will be :-
JEE Main 2019 (Online) 9th April Evening Slot
145
The resistance of a galvanometer is 50 ohm and the maximum current which can be passed through it is 0.002 A. What resistance must be connected to it in order to convert it into an ammeter of range 0 – 0.5 A ?
JEE Main 2019 (Online) 9th April Evening Slot
146
In a conductor, if the number of conduction electrons per unit volume is 8.5 × 1028 m–3 and mean free time is 25ƒs (femto second), it's approximate resistivity is :-
(me = 9.1 × 10–31 kg)
JEE Main 2019 (Online) 9th April Evening Slot
147
A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is : (E is mid-point of arm CD) JEE Main 2019 (Online) 9th April Morning Slot Physics - Current Electricity Question 245 English
JEE Main 2019 (Online) 9th April Morning Slot
148
A moving coil galvanometer has resistance 50$$\Omega $$ and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k$$\Omega $$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to :
JEE Main 2019 (Online) 9th April Morning Slot
149
In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 $$\Omega $$/cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be :- JEE Main 2019 (Online) 8th April Evening Slot Physics - Current Electricity Question 248 English
JEE Main 2019 (Online) 8th April Evening Slot
150
A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when :-
JEE Main 2019 (Online) 8th April Evening Slot
151
In the figure shown, what is the current (in Ampere) drawn from the battery ?
You are given: R1 = 15$$\Omega $$, R2 = 10 $$\Omega $$, R3 = 20 $$\Omega $$, R4 = 5$$\Omega $$, R5 = 25$$\Omega $$, R6 = 30 $$\Omega $$, E = 15 V JEE Main 2019 (Online) 8th April Evening Slot Physics - Current Electricity Question 246 English
JEE Main 2019 (Online) 8th April Evening Slot
152
A 200 $$\Omega $$ resistor has a certain color code. If one replaces the red color by green in the code, the new resistance will be :
JEE Main 2019 (Online) 8th April Morning Slot
153
For the circuit shown, with R1 = 1.0W, R2 = 2.0 W, E1 = 2 V and E2 = E3 = 4 V, the potential difference between the points 'a' and 'b' is approximately (in V): JEE Main 2019 (Online) 8th April Morning Slot Physics - Current Electricity Question 249 English
JEE Main 2019 (Online) 8th April Morning Slot
154
In the given circuit diagram, the currents, I1 = – 0.3 A, I4 = 0.8 A and I5 = 0.4 A, are flowing as shown. The currents I2, I3 and I6, respectively, are :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Current Electricity Question 251 English
JEE Main 2019 (Online) 12th January Evening Slot
155
A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 $$ \times $$ 10–4 A passes through it, its needle ( pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of :
JEE Main 2019 (Online) 12th January Evening Slot
156
In a meter bridge, the wire of length 1 m has a non-uniform cross-section such that, the variation $${{dR} \over {d\ell }}$$ of its resistance R with length $$\ell $$ is $${{dR} \over {d\ell }}$$ $$ \propto $$ $${1 \over {\sqrt \ell }}$$. Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP ?

JEE Main 2019 (Online) 12th January Morning Slot Physics - Current Electricity Question 254 English
JEE Main 2019 (Online) 12th January Morning Slot
157
Two electric bulbs, rated at (25 W, 220 V) and (100 W, 220 V), are connected in series across a 220 V voltage source. If the 25 W and 100 W bulbs draw powers P1 and P2 respectively, then :
JEE Main 2019 (Online) 12th January Morning Slot
158
The galvanometer deflection, when key K1 is closed but K2 is open, equals $$\theta $$0 (see figure). On closing K2 also and adjusting R2 to 5$$\Omega $$, the deflection in galvanometer becomes $${{{\theta _0}} \over 5}.$$ . The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery] :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Current Electricity Question 256 English
JEE Main 2019 (Online) 12th January Morning Slot
159
An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and esistance 5 $$\Omega $$. The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire, is :
JEE Main 2019 (Online) 12th January Morning Slot
160
A galvanometer having a resistance of 20 $$\Omega $$ and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is:
JEE Main 2019 (Online) 11th January Evening Slot
161
In the circuit shown, the potential difference between A and B is :

JEE Main 2019 (Online) 11th January Evening Slot Physics - Current Electricity Question 258 English
JEE Main 2019 (Online) 11th January Evening Slot
162
In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 $$\Omega $$ resistor is connected in series with R1, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R1 + 10) $$\Omega $$ such that the null point shifts back to its initial position is :

JEE Main 2019 (Online) 11th January Evening Slot Physics - Current Electricity Question 257 English
JEE Main 2019 (Online) 11th January Evening Slot
163
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
JEE Main 2019 (Online) 11th January Morning Slot
164
The resistance of the meter bridge AB in given figure is 4 $$\Omega $$. With a cell of emf $$\varepsilon $$ = 0.5 V and rheostat resistance Rh = 2 $$\Omega $$ the null point is obtained at some point J. When the cell is replaced by another one of emf $$\varepsilon $$ = $$\varepsilon $$2 the same null point J is found for Rh = 6 $$\Omega $$. The emf $$\varepsilon $$2 is, :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Current Electricity Question 261 English
JEE Main 2019 (Online) 11th January Morning Slot
165
In a Wheatstone bridge(see fig.), Resistances P and Q are approximately equal. When R = 400 $$\Omega $$, the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405 $$\Omega $$. The value of X is close to :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Current Electricity Question 260 English
JEE Main 2019 (Online) 11th January Morning Slot
166
A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power supply of 11 V is connected across it is -
JEE Main 2019 (Online) 10th January Evening Slot
167
The actual value of resistance R, shown in the figure is 30$$\Omega $$. This is measuered in an experiment as shown using the standard formula R = $${V \over {\rm I}}$$, where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Current Electricity Question 263 English
JEE Main 2019 (Online) 10th January Evening Slot
168
The Wheatstone bridge shown in figure, here, gets balanced when the carbon resistor used as R1 has the colour code (Orange, Red, Brown). The resistors R2 and R4 are 80$$\Omega $$ and 40$$\Omega $$, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as R3, would be -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Current Electricity Question 264 English
JEE Main 2019 (Online) 10th January Evening Slot
169
A uniform metallic wire has a resistance of 18 $$\Omega $$ and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is -
JEE Main 2019 (Online) 10th January Morning Slot
170
A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is -
JEE Main 2019 (Online) 10th January Morning Slot
171
In the given circuit the cells have zero internal resistance. The currents (in Amperes) passing through resistance R1 and R2 respectively, are -

JEE Main 2019 (Online) 10th January Morning Slot Physics - Current Electricity Question 267 English
JEE Main 2019 (Online) 10th January Morning Slot
172
A potentiometer wire AB having length L and resistance 12 r is joined to a cell D of emf $$\varepsilon $$ and internal resistance r. A cell C having emf $$\varepsilon $$/2 and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in figure shows no deflection is –

JEE Main 2019 (Online) 10th January Morning Slot Physics - Current Electricity Question 266 English
JEE Main 2019 (Online) 10th January Morning Slot
173
In the given circuit the the internal resistance of the 18 V cell is negligible. If R1 = 400 $$\Omega $$, R3 = 100 $$\Omega $$ and R4 = 500 $$\Omega $$ and the reading of an ideal voltmeter across R4 is 5V, then the value of R2 will be :

JEE Main 2019 (Online) 9th January Evening Slot Physics - Current Electricity Question 270 English
JEE Main 2019 (Online) 9th January Evening Slot
174
A carbon resistance has a following colour code. What is the value of the resistance ?

JEE Main 2019 (Online) 9th January Evening Slot Physics - Current Electricity Question 271 English
JEE Main 2019 (Online) 9th January Evening Slot
175
When the switch S, in the circuit shown, is closed, then the value of current i will be :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 274 English
JEE Main 2019 (Online) 9th January Morning Slot
176
A resistance is shown in the figure. Its value and tolerance are given respectively by :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Current Electricity Question 273 English
JEE Main 2019 (Online) 9th January Morning Slot
177
Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm2, is $$\upsilon $$. If the electron density in copper is 9 $$ \times $$ 1028/m3 the value of $$\upsilon $$. in mm/s is close to (Take charge of electron to be = 1.6 $$ \times $$ 10$$-$$19C)
JEE Main 2019 (Online) 9th January Morning Slot
178
A heating element has a resistance of 100 $$\Omega $$ at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500oC more than room temperature. what is the temperature coefficient of resistance of the heating element ?
JEE Main 2018 (Online) 16th April Morning Slot
179
A galvanometer with its coil resistance 25 $$\Omega $$ requires a current of 1 mA for its full deflection. In order to construct an ammeter to read upto a current of 2 A, the approximate value of the shunt resistance should be :
JEE Main 2018 (Online) 16th April Morning Slot
180
In a circuit for finding the resistance of a galvanometer by half deflection method, a 6 V battery and a high resistance of 11 k$$\Omega $$ are used. The figure of merit of the galvanometer is 60 $$\mu A/$$division. In the absence of shunt resistance, the galvanometer produces a deflection of $$\theta $$ = 9 divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of $$\theta /2,$$ is closest to :
JEE Main 2018 (Online) 16th April Morning Slot
181
Two batteries with e.m.f 12 V and 13 V are connected in parallel across a load resistor of 10 $$\Omega $$. The internal resistances of the two batteries are 1 $$\Omega $$ and 2 $$\Omega $$ respectively. The voltage across the load lies between :
JEE Main 2018 (Offline)
182
On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is 1 k$$\Omega $$. How much was the resistance on the left slot before interchanging the resistances?
JEE Main 2018 (Offline)
183
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance of 5 $$\Omega$$, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.
JEE Main 2018 (Offline)
184
A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is $$\rho $$, how long will the changes take to travel a distance d ?
JEE Main 2018 (Online) 15th April Evening Slot
185
A constant voltages is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be :
JEE Main 2018 (Online) 15th April Evening Slot
186
JEE Main 2018 (Online) 15th April Morning Slot Physics - Current Electricity Question 290 English
In a meter bridge, as shown in the figure, it is given that resistance $$Y = 12.5\,\,\Omega $$ and that the balance is obtained at a distance $$39.5$$ $$cm$$ from end $$A$$ (by Jockey J). After interchanging the resistances $$X$$ and $$Y$$, a new balance point is found at a distance $${l_2}$$ from end $$A.$$ What are the value of $$X$$ and $${l_2}$$ ?
JEE Main 2018 (Online) 15th April Morning Slot
187
In the given circuit all resistances are of value $$R$$ $$ohm$$ each. The equivalent resistance between $$A$$ and $$B$$ is :

JEE Main 2018 (Online) 15th April Morning Slot Physics - Current Electricity Question 289 English
JEE Main 2018 (Online) 15th April Morning Slot
188
The figure shows three circuits I, II and III which are connected to a 3V battery. If the powers dissipated by the configurations I, II and III are P1 , P2 and P3 respectively, then :

JEE Main 2017 (Online) 9th April Morning Slot Physics - Current Electricity Question 280 English
JEE Main 2017 (Online) 9th April Morning Slot
189
In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P = 4 $$\Omega $$ and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :

JEE Main 2017 (Online) 9th April Morning Slot Physics - Current Electricity Question 279 English
JEE Main 2017 (Online) 9th April Morning Slot
190
A uniform wire of length 1 and radius r has a resistance of 100 $$\Omega $$. It is recast into a wire of radius $${r \over 2}.$$ The resistance of new wire will be :
JEE Main 2017 (Online) 9th April Morning Slot
191
JEE Main 2017 (Online) 8th April Morning Slot Physics - Current Electricity Question 282 English
A 9 V battery with internal resistance of 0.5 $$\Omega $$ is connected across an infinite network as shown in the figure. All ammeters A1, A2, 3 and voltmeter V are ideal.
Choose correct statement.
JEE Main 2017 (Online) 8th April Morning Slot
192
A potentiometer PQ is set up to compare two resistances as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key K3 is open. The balance point is at a length $$\ell $$1 cm from P when two way key K3 is plugged in between 2 and 1, while the balance point is at a length $$\ell $$2 cm from P when key K3 is plugged in between 3 and 1. The ratio of two resistances $${{{R_1}} \over {{R_2}}}$$, is found to be :

JEE Main 2017 (Online) 8th April Morning Slot Physics - Current Electricity Question 283 English
JEE Main 2017 (Online) 8th April Morning Slot
193
Which of the following statements is false?
JEE Main 2017 (Offline)
194
JEE Main 2017 (Offline) Physics - Current Electricity Question 294 English
In the given circuit, the current in each resistance is:
JEE Main 2017 (Offline)
195
When a current of 5 mA is passed through a galvanometer having a coil of resistance 15$$\Omega $$, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0 – 10V is:
JEE Main 2017 (Offline)
196
A galvanometer has a 50 division scale. Battery has no internal resistance. It is found that there is deflection of 40 divisions when R = 2400 $$\Omega $$. Deflection becomes 20 divisions when resistance taken from resistance box is 4900 $$\Omega $$. Then we can conclude :

JEE Main 2016 (Online) 10th April Morning Slot Physics - Current Electricity Question 275 English
JEE Main 2016 (Online) 10th April Morning Slot
197
The resistance of an electrical toaster has a temperature dependence given by R(T) = R0 [1 + $$\alpha $$(T − T0)] in its range of operation. At T0 = 300 K, R = 100 $$\Omega $$ and at T = 500 K, R = 120 $$\Omega $$. The toaster is connected to a voltage source at 200 V and its temperature is raised at a constant rate from 300 to 500 K in 30 s. The total work done in raising the temperature is :
JEE Main 2016 (Online) 10th April Morning Slot
198
JEE Main 2016 (Online) 9th April Morning Slot Physics - Current Electricity Question 277 English
In the circuit shown, the resistance r is a variable resistance. If for r = fR, the heat generation in r is maximum then the value of f is :
JEE Main 2016 (Online) 9th April Morning Slot
199
A 50 $$\Omega $$ resistance is connected to a battery of 5 V. A galvanometer of resistance 100 $$\Omega $$ is to be used as an ammeter to measure current through the resistance, for this a resistance rs is connected to the galvanometer. Which of the following connections should be employed if the measured current is within 1% of thecurrent without the ammeter in the circuit ?
JEE Main 2016 (Online) 9th April Morning Slot
200
A galvanometer having a coil resistance of $$100\,\Omega $$ gives a full scale deflection, when a currect of $$1$$ $$mA$$ is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of $$10$$ $$A,$$ is :
JEE Main 2016 (Offline)
201
JEE Main 2015 (Offline) Physics - Current Electricity Question 298 English
In the circuit shown, the current in the $$1\Omega $$ resistor is :
JEE Main 2015 (Offline)
202
When $$5V$$ potential difference is applied across a wire of length $$0.1$$ $$m,$$ the drift speed of electrons is $$2.5 \times {10^{ - 4}}\,\,m{s^{ - 1}}.$$ If the electron density in the wire is $$8 \times {10^{28}}\,\,{m^{ - 3}},$$ the resistivity of the material is close to :
JEE Main 2015 (Offline)
203
In a large building, three are $$15$$ bulbs of $$40$$ $$W$$, $$5$$ bulbs of $$100$$ $$W$$, $$5$$ fans of $$80$$ $$W$$ and $$1$$ heater of $$1$$ $$kW.$$ The voltage of electric mains is $$220$$ $$V.$$ The minimum capacity of the main fuse of the building will be:
JEE Main 2014 (Offline)
204
The supply voltage to room is $$120V.$$ The resistance of the lead wires is $$6\Omega $$. A $$60$$ $$W$$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $$240$$ $$W$$ heater is switched on in parallel to the bulb?
JEE Main 2013 (Offline)
205
This questions has Statement - $${\rm I}$$ and Statement - $${\rm I}$$$${\rm I}$$. Of the four choices given after the Statements, choose the one that best describes into two Statements.

Statement - $${\rm I}$$ : Higher the range, greater is the resistance of ammeter.
Statement - $${\rm I}$$$${\rm I}$$ : To increase the range of ammeter, additional shunt needs to be used across it.

JEE Main 2013 (Offline)
206
Two electric bulbs marked $$25W$$ $$-$$ $$220$$ $$V$$ and $$100W$$ $$-$$ $$220V$$ are connected in series to a $$440$$ $$V$$ supply. Which of the bulbs will fuse?
AIEEE 2012
207
If a wire is stretched to make it $$0.1\% $$ longer, its resistance will:
AIEEE 2011
208
Two conductors have the same resistance at $${0^ \circ }C$$ but their temperature coefficients of resistance are $${\alpha _1}$$ and $${\alpha _2}.$$ The respective temperature coefficients of their series and parallel combinations are nearly
AIEEE 2010
209
Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. AIEEE 2008 Physics - Current Electricity Question 302 English

The value of the unknown resister $$R$$ is

AIEEE 2008
210
Consider a block of conducting material of resistivity $$'\rho '$$ shown in the figure. Current $$'I'$$ enters at $$'A'$$ and leaves from $$'D'$$. We apply superposition principle to find voltage $$'\Delta V'$$ developed between $$'B'$$ and $$'C'$$. The calculation is done in the following steps:
(i) Take current $$'I'$$ entering from $$'A'$$ and assume it to spread over a hemispherical surface in the block.
(ii) Calculate field $$E(r)$$ at distance $$'r'$$ from A by using Ohm's law $$E = \rho j,$$ where $$j$$ is the current per unit area at $$'r'$$.
(iii) From the $$'r'$$ dependence of $$E(r)$$, obtain the potential $$V(r)$$ at $$r$$.
(iv) Repeat (i), (ii) and (iii) for current $$'I'$$ leaving $$'D'$$ and superpose results for $$'A'$$ and $$'D'.$$ AIEEE 2008 Physics - Current Electricity Question 300 English

For current entering at $$A,$$ the electric field at a distance $$'r'$$ from $$A$$ is

AIEEE 2008
211
Consider a block of conducting material of resistivity $$'\rho '$$ shown in the figure. Current $$'I'$$ enters at $$'A'$$ and leaves from $$'D'$$. We apply superposition principle to find voltage $$'\Delta V'$$ developed between $$'B'$$ and $$'C'$$. The calculation is done in the following steps:
(i) Take current $$'I'$$ entering from $$'A'$$ and assume it to spread over a hemispherical surface in the block.
(ii) Calculate field $$E(r)$$ at distance $$'r'$$ from A by using Ohm's law $$E = \rho j,$$ where $$j$$ is the current per unit area at $$'r'$$.
(iii) From the $$'r'$$ dependence of $$E(r)$$, obtain the potential $$V(r)$$ at $$r$$.
(iv) Repeat (i), (ii) and (iii) for current $$'I'$$ leaving $$'D'$$ and superpose results for $$'A'$$ and $$'D'.$$ AIEEE 2008 Physics - Current Electricity Question 301 English

$$\Delta V$$ measured between $$B$$ and $$C$$ is

AIEEE 2008
212
A $$5V$$ battery with internal resistance $$2\Omega $$ and a $$2V$$ battery with internal resistance $$1\Omega $$ are connected to a $$10\Omega $$ resistor as shown in the figure. AIEEE 2008 Physics - Current Electricity Question 299 English

The current in the $$10\Omega $$ resistor is

AIEEE 2008
213
The resistance of a wire is $$5$$ ohm at $${50^ \circ }C$$ and $$6$$ ohm at $${100^ \circ }C.$$ The resistance of the wire at $${0^ \circ }C$$ will be
AIEEE 2007
214
A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will
AIEEE 2006
215
An electric bulb is rated $$220$$ volt - $$100$$ watt. The power consumed by it when operated on $$110$$ volt will be
AIEEE 2006
216
In a Wheatstone's bridge, three resistance $$P, Q$$ and $$R$$ connected in the three arms and the fourth arm is formed by two resistances $${S_1}$$ and $${S_2}$$ connected in parallel. The condition for the bridge to be balanced will be
AIEEE 2006
217
The resistance of bulb filmanet is $$100\Omega $$ at a temperature of $${100^ \circ }C.$$ If its temperature coefficient of resistance be $$0.005$$ per $$^ \circ C$$, its resistance will become $$200\,\Omega $$ at a temperature of
AIEEE 2006
218
The current $${\rm I}$$ drawn from the $$5$$ volt source will be AIEEE 2006 Physics - Current Electricity Question 303 English
AIEEE 2006
219
A moving coil galvanometer has $$150$$ equal divisions. Its current sensitivity is $$10$$- divisions per milliampere and voltage sensitivity is $$2$$ divisions per millivolt. In order that each division reads $$1$$ volt, the resistance in $$ohms$$ needed to be connected in series with the coil will be -
AIEEE 2005
220
An energy source will supply a constant current into the load if its internal resistance is
AIEEE 2005
221
In a potentiometer experiment the balancing with a cell is at length $$240$$ $$cm.$$ On shunting the cell with a resistance of $$2\Omega ,$$ the balancing length becomes $$120$$ $$cm$$. The internal resistance of the cell is
AIEEE 2005
222
The resistance of hot tungsten filament is about $$10$$ times the cold resistance. What will be resistance of $$100$$ $$W$$ and $$200$$ $$V$$ lamp when not in use ?
AIEEE 2005
223
Two voltmeters, one of copper and another of silver, are joined in parallel. When a total charge $$q$$ flows through the voltmeters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $${Z_1}$$ and $${Z_2}$$ respectively the charge which flows through the silver voltmeter is
AIEEE 2005
224
Two sources of equal $$emf$$ are connected to an external resistance $$R.$$ The internal resistance of the two sources are $${R_1}$$ and $${R_2}\left( {{R_1} > {R_1}} \right).$$ If the potential difference across the source having internal resistance $${R_2}$$ is zero, then
AIEEE 2005
225
In the circuit, the galvanometer $$G$$ shows zero deflection. If the batteries $$A$$ and $$B$$ have negligible internal resistance, the value of the resistor $$R$$ will be - AIEEE 2005 Physics - Current Electricity Question 324 English
AIEEE 2005
226
A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be
AIEEE 2005
227
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii are in the ratio of $${4 \over 3}$$ and $${2 \over 3}$$, then the ratio of the current passing through the wires will be
AIEEE 2004
228
The resistance of the series combination of two resistances is $$S.$$ When they are jointed in parallel the total resistance is $$P.$$ If $$S = nP$$ then the Minimum possible value of $$n$$ is
AIEEE 2004
229
The total current supplied to the circuit by the battery is AIEEE 2004 Physics - Current Electricity Question 332 English
AIEEE 2004
230
Thermistors are usually made of
AIEEE 2004
231
In a meter bridge experiment null point is obtained at $$20$$ $$cm$$, from one end of the wire when resistance $$X$$ is balanced against another resistance $$Y.$$ If $$X < Y$$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $$4$$ $$X$$ against $$Y$$
AIEEE 2004
232
The thermo $$emf$$ of a thermocouple varies with temperature $$\theta $$ of the hot junction as $$E = a\theta + b{\theta ^2}$$ in volts where the ratio $$a/b$$ is $${700^ \circ }C.$$ If the cold junction is kept at $${0^ \circ }C,$$ then the neutral temperature is
AIEEE 2004
233
The electrochemical equivalent of a metal is $${3.35109^{ - 7}}$$ $$kg$$ per Coulomb. The mass of the metal liberated at the cathode when a $$3A$$ current is passed for $$2$$ seconds will be
AIEEE 2004
234
The Kirchhoff's first law $$\left( {\sum i = 0} \right)$$ and second law $$\left( {\sum iR = \sum E} \right),$$ where the symbols have their usual meanings, are respectively based on
AIEEE 2004
235
A material $$'B'$$ has twice the specific resistance of $$'A'.$$ A circular wire made of $$'B'$$ has twice the diameter of a wire made of $$'A'$$. Then for the two wires to have the same resistance, the ratio $${l \over B}/{l \over A}$$ of their respective lengths must be
AIEEE 2004
236
The length of a given cylindrical wire is increased by $$100\% $$. Due to the consequent decrease in diameter the change in the resistance of the wire will be
AIEEE 2003
237
A $$220$$ volt, $$1000$$ watt bulb is connected across a $$110$$ $$volt$$ mains supply. The power consumed will be
AIEEE 2003
238
A $$3$$ volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current $${\rm I}$$, in the circuit will be AIEEE 2003 Physics - Current Electricity Question 334 English
AIEEE 2003
239
The nagative $$Zn$$ pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by $$0.13g$$ in $$30$$ minutes. If the electrochemical equivalent of $$Zn$$ and $$Cu$$ are $$32.5$$ and $$31.5$$ respectively, the increase in the mass of the positive $$Cu$$ pole in this time is
AIEEE 2003
240
The thermo $$e.m.f.$$ of a thermo -couple is $$25$$ $$\mu V/{}^ \circ C$$ at room temperature. A galvanometer of $$40$$ $$ohm$$ resistance, capable of detecting current as low as $${10^{ - 5}}\,A,$$ is connected with the thermo couple. The smallest temperature difference that can be detected by this system is
AIEEE 2003
241
The length of a wire of a potentiometer is $$100$$ $$cm$$, and the $$e.$$ $$m.$$ $$f.$$ of its standard cell is $$E$$ volt. It is employed to measure the $$e.m.f.$$ of a battery whose internal resistance in $$0.5\Omega .$$ If the balance point is obtained at $$1=30$$ $$cm$$ from the positive end, the $$e.m.f.$$ of the battery is

where $$i$$ is the current in the potentiometer wire.

AIEEE 2003
242
An ammeter reads upto $$1$$ ampere. Its internal resistance is $$0.81$$ $$ohm$$. To increase the range to $$10$$ $$A$$ the value of the required shunt is
AIEEE 2003
243
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a
AIEEE 2002
244
A wire when connected to $$220$$ $$V$$ mains supply has power dissipation $${P_1}.$$ Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is $${P_2}.$$ Then $${P_2}:{P_1}$$ is
AIEEE 2002
245
If in the circuit, power dissipation is $$150W,$$ then $$R$$ is AIEEE 2002 Physics - Current Electricity Question 341 English
AIEEE 2002
246
The mass of product liberated on anode in an electrochemical cell depends on (where $$t$$ is the time period for which the current is passed).
AIEEE 2002
247
If $${\theta _1},$$ is the inversion temperature, $${\theta _n}$$ is the neutral temperature, $${\theta _c}$$ is the temperature of the cold junction, then
AIEEE 2002

Numerical

1

The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be _______ A.

JEE Main 2025 (Online) 28th January Evening Shift Physics - Current Electricity Question 8 English
JEE Main 2025 (Online) 28th January Evening Shift
2

A wire of resistance $9 \Omega$ is bent to form an equilateral triangle. Then the equivalent resistance across any two vertices will be _________ ohm.

JEE Main 2025 (Online) 24th January Morning Shift
3

The net current flowing in the given circuit is __________ A.

JEE Main 2025 (Online) 22nd January Evening Shift Physics - Current Electricity Question 7 English

JEE Main 2025 (Online) 22nd January Evening Shift
4

To determine the resistance (R) of a wire, a circuit is designed below. The $$V$$-$$I$$ characteristic curve for this circuit is plotted for the voltmeter and the ammeter readings as shown in figure. The value of $R$ is _________ $$\Omega$$.

JEE Main 2024 (Online) 9th April Evening Shift Physics - Current Electricity Question 34 English

JEE Main 2024 (Online) 9th April Evening Shift
5

At room temperature $$(27^{\circ} \mathrm{C})$$, the resistance of a heating element is $$50 \Omega$$. The temperature coefficient of the material is $$2.4 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1}$$. The temperature of the element, when its resistance is $$62 \Omega$$, is __________$${ }^{\circ} \mathrm{C}$$.

JEE Main 2024 (Online) 9th April Evening Shift
6

The current flowing through the $$1 \Omega$$ resistor is $$\frac{n}{10}$$ A. The value of $$n$$ is _______.

JEE Main 2024 (Online) 9th April Morning Shift Physics - Current Electricity Question 30 English

JEE Main 2024 (Online) 9th April Morning Shift
7

A heater is designed to operate with a power of $$1000 \mathrm{~W}$$ in a $$100 \mathrm{~V}$$ line. It is connected in combination with a resistance of $$10 \Omega$$ and a resistance $$R$$, to a $$100 \mathrm{~V}$$ mains as shown in figure. For the heater to operate at $$62.5 \mathrm{~W}$$, the value of $$\mathrm{R}$$ should be _______ $$\Omega$$.

JEE Main 2024 (Online) 8th April Evening Shift Physics - Current Electricity Question 24 English

JEE Main 2024 (Online) 8th April Evening Shift
8

Resistance of a wire at $$0^{\circ} \mathrm{C}, 100^{\circ} \mathrm{C}$$ and $$t^{\circ} \mathrm{C}$$ is found to be $$10 \Omega, 10.2 \Omega$$ and $$10.95 \Omega$$ respectively. The temperature $$t$$ in Kelvin scale is _________.

JEE Main 2024 (Online) 8th April Morning Shift
9

In the given figure an ammeter A consists of a $$240 \Omega$$ coil connected in parallel to a $$10 \Omega$$ shunt. The reading of the ammeter is ________ $$\mathrm{mA}$$.

JEE Main 2024 (Online) 6th April Evening Shift Physics - Current Electricity Question 15 English

JEE Main 2024 (Online) 6th April Evening Shift
10

A wire of resistance $$R$$ and radius $$r$$ is stretched till its radius became $$r / 2$$. If new resistance of the stretched wire is $$x ~R$$, then value of $$x$$ is ________.

JEE Main 2024 (Online) 6th April Morning Shift
11

A wire of resistance $$20 \Omega$$ is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is _________ $$\Omega$$.

JEE Main 2024 (Online) 5th April Evening Shift
12

In the experiment to determine the galvanometer resistance by half-deflection method, the plot of $$1 / \theta$$ vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is _________ $$\times 10^{-1} \mathrm{~A} /$$ division. [The source has emf $$2 \mathrm{~V}$$]

JEE Main 2024 (Online) 5th April Morning Shift Physics - Current Electricity Question 21 English

JEE Main 2024 (Online) 5th April Morning Shift
13

Two wires $$A$$ and $$B$$ are made up of the same material and have the same mass. Wire $$A$$ has radius of $$2.0 \mathrm{~mm}$$ and wire $$B$$ has radius of $$4.0 \mathrm{~mm}$$. The resistance of wire $$B$$ is $$2 \Omega$$. The resistance of wire $$A$$ is ________ $$\Omega$$.

JEE Main 2024 (Online) 4th April Evening Shift
14

Twelve wires each having resistance $$2 \Omega$$ are joined to form a cube. A battery of $$6 \mathrm{~V}$$ emf is joined across point $$a$$ and $$c$$. The voltage difference between $$e$$ and $$f$$ is ________ V.

JEE Main 2024 (Online) 4th April Morning Shift Physics - Current Electricity Question 28 English

JEE Main 2024 (Online) 4th April Morning Shift
15
The current in a conductor is expressed as $I=3 t^2+4 t^3$, where $I$ is in Ampere and $t$ is in second. The amount of electric charge that flows through a section of the conductor during $t=1 \mathrm{~s}$ to $t=2 \mathrm{~s}$ is __________ C.
JEE Main 2024 (Online) 1st February Morning Shift
16

In the following circuit, the battery has an emf of $$2 \mathrm{~V}$$ and an internal resistance of $$\frac{2}{3} \Omega$$. The power consumption in the entire circuit is _________ W.

JEE Main 2024 (Online) 31st January Evening Shift Physics - Current Electricity Question 48 English

JEE Main 2024 (Online) 31st January Evening Shift
17

Equivalent resistance of the following network is __________ $$\Omega$$.

JEE Main 2024 (Online) 31st January Morning Shift Physics - Current Electricity Question 47 English

JEE Main 2024 (Online) 31st January Morning Shift
18

Two resistance of $$100 \Omega$$ and $$200 \Omega$$ are connected in series with a battery of $$4 \mathrm{~V}$$ and negligible internal resistance. A voltmeter is used to measure voltage across $$100 \Omega$$ resistance, which gives reading as $$1 \mathrm{~V}$$. The resistance of voltmeter must be _______ $$\Omega$$.

JEE Main 2024 (Online) 30th January Evening Shift
19

Two cells are connected in opposition as shown. Cell $$\mathrm{E}_1$$ is of $$8 \mathrm{~V}$$ emf and $$2 \Omega$$ internal resistance; the cell $$\mathrm{E}_2$$ is of $$2 \mathrm{~V}$$ emf and $$4 \Omega$$ internal resistance. The terminal potential difference of cell $$\mathrm{E}_2$$ is __________ V.

JEE Main 2024 (Online) 30th January Morning Shift Physics - Current Electricity Question 37 English

JEE Main 2024 (Online) 30th January Morning Shift
20

In the given circuit, the current flowing through the resistance $$20 \Omega$$ is $$0.3 \mathrm{~A}$$, while the ammeter reads $$0.9 \mathrm{~A}$$. The value of $$\mathrm{R}_1$$ is _________ $$\Omega$$.

JEE Main 2024 (Online) 29th January Evening Shift Physics - Current Electricity Question 39 English

JEE Main 2024 (Online) 29th January Evening Shift
21
A network of four resistances is connected to $9 \mathrm{~V}$ battery, as shown in figure. The magnitude of voltage difference between the points $\mathrm{A}$ and $\mathrm{B}$ is __________ $V$.

JEE Main 2023 (Online) 15th April Morning Shift Physics - Current Electricity Question 81 English
JEE Main 2023 (Online) 15th April Morning Shift
22

When a resistance of $$5 ~\Omega$$ is shunted with a moving coil galvanometer, it shows a full scale deflection for a current of $$250 \mathrm{~mA}$$, however when $$1050 ~\Omega$$ resistance is connected with it in series, it gives full scale deflection for 25 volt. The resistance of galvanometer is ____________ $$\Omega$$.

JEE Main 2023 (Online) 13th April Morning Shift
23

A potential $$\mathrm{V}_{0}$$ is applied across a uniform wire of resistance $$R$$. The power dissipation is $$P_{1}$$. The wire is then cut into two equal halves and a potential of $$V_{0}$$ is applied across the length of each half. The total power dissipation across two wires is $$P_{2}$$. The ratio $$P_{2}: \mathrm{P}_{1}$$ is $$\sqrt{x}: 1$$. The value of $$x$$ is ___________.

JEE Main 2023 (Online) 13th April Morning Shift
24

The current flowing through a conductor connected across a source is $$2 \mathrm{~A}$$ and 1.2 $$\mathrm{A}$$ at $$0^{\circ} \mathrm{C}$$ and $$100^{\circ} \mathrm{C}$$ respectively. The current flowing through the conductor at $$50^{\circ} \mathrm{C}$$ will be ___________ $$\times 10^{2} \mathrm{~mA}$$.

JEE Main 2023 (Online) 12th April Morning Shift
25

Two identical cells each of emf $$1.5 \mathrm{~V}$$ are connected in series across a $$10 ~\Omega$$ resistance. An ideal voltmeter connected across $$10 ~\Omega$$ resistance reads $$1.5 \mathrm{~V}$$. The internal resistance of each cell is __________ $$\Omega$$.

JEE Main 2023 (Online) 11th April Evening Shift
26

In the circuit diagram shown in figure given below, the current flowing through resistance $$3 ~\Omega$$ is $$\frac{x}{3} A$$.

The value of $$x$$ is ___________

JEE Main 2023 (Online) 11th April Morning Shift Physics - Current Electricity Question 71 English

JEE Main 2023 (Online) 11th April Morning Shift
27

A rectangular parallelopiped is measured as $$1 \mathrm{~cm} \times 1 \mathrm{~cm} \times 100 \mathrm{~cm}$$. If its specific resistance is $$3 \times 10^{-7} ~\Omega \mathrm{m}$$, then the resistance between its two opposite rectangular faces will be ___________ $$\times 10^{-7} ~\Omega$$.

JEE Main 2023 (Online) 10th April Evening Shift
28

10 resistors each of resistance 10 $$\Omega$$ can be connected in such as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be ___________.

JEE Main 2023 (Online) 10th April Morning Shift
29

The number density of free electrons in copper is nearly $$8 \times 10^{28} \mathrm{~m}^{-3}$$. A copper wire has its area of cross section $$=2 \times 10^{-6} \mathrm{~m}^{2}$$ and is carrying a current of $$3.2 \mathrm{~A}$$. The drift speed of the electrons is ___________ $$\times 10^{-6} \mathrm{ms}^{-1}$$

JEE Main 2023 (Online) 8th April Evening Shift
30

A current of $$2 \mathrm{~A}$$ flows through a wire of cross-sectional area $$25.0 \mathrm{~mm}^{2}$$. The number of free electrons in a cubic meter are $$2.0 \times 10^{28}$$. The drift velocity of the electrons is __________ $$\times 10^{-6} \mathrm{~ms}^{-1}$$ (given, charge on electron $$=1.6 \times 10^{-19} \mathrm{C}$$ ).

JEE Main 2023 (Online) 8th April Morning Shift
31

As shown in the figure, the voltmeter reads $$2 \mathrm{~V}$$ across $$5 ~\Omega$$ resistor. The resistance of the voltmeter is _________ $$\Omega$$.

JEE Main 2023 (Online) 6th April Evening Shift Physics - Current Electricity Question 62 English

JEE Main 2023 (Online) 6th April Evening Shift
32

The length of a metallic wire is increased by $$20 \%$$ and its area of cross section is reduced by $$4 \%$$. The percentage change in resistance of the metallic wire is __________.

JEE Main 2023 (Online) 6th April Morning Shift
33

In the given circuit, the value of $$\left| {{{{\mathrm{I_1}} + {\mathrm{I_3}}} \over {{\mathrm{I_2}}}}} \right|$$ is _____________

JEE Main 2023 (Online) 1st February Evening Shift Physics - Current Electricity Question 107 English

JEE Main 2023 (Online) 1st February Evening Shift
34

In an experiment to find emf of a cell using potentiometer, the length of null point for a cell of emf $$1.5 \mathrm{~V}$$ is found to be $$60 \mathrm{~cm}$$. If this cell is replaced by another cell of emf E, the length-of null point increases by $$40 \mathrm{~cm}$$. The value of $$E$$ is $$\frac{x}{10} V$$. The value of $$x$$ is ____________.

JEE Main 2023 (Online) 1st February Morning Shift
35

Two identical cells, when connected either in parallel or in series gives same current in an external resistance $$5 ~\Omega$$. The internal resistance of each cell will be ___________ $$\Omega$$.

JEE Main 2023 (Online) 31st January Morning Shift
36

If the potential difference between $\mathrm{B}$ and $\mathrm{D}$ is zero, the value of $x$ is $\frac{1}{n} \Omega$. The value of $n$ is __________.

JEE Main 2023 (Online) 30th January Evening Shift Physics - Current Electricity Question 99 English

JEE Main 2023 (Online) 30th January Evening Shift
37

In the following circuit, the magnitude of current I1, is ___________ A.

JEE Main 2023 (Online) 30th January Morning Shift Physics - Current Electricity Question 98 English

JEE Main 2023 (Online) 30th January Morning Shift
38

A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5$$\Omega$$. When a resistance of 15$$\Omega$$ is used for shunting, null point moves to 300 cm. The internal resistance of the cell is ___________$$\Omega$$.

JEE Main 2023 (Online) 29th January Evening Shift
39

When two resistance $$\mathrm{R_1}$$ and $$\mathrm{R_2}$$ connected in series and introduced into the left gap of a meter bridge and a resistance of 10 $$\Omega$$ is introduced into the right gap, a null point is found at 60 cm from left side. When $$\mathrm{R_1}$$ and $$\mathrm{R_2}$$ are connected in parallel and introduced into the left gap, a resistance of 3 $$\Omega$$ is introduced into the right gap to get null point at 40 cm from left end. The product of $$\mathrm{R_1}$$ $$\mathrm{R_2}$$ is ____________$$\Omega^2$$

JEE Main 2023 (Online) 29th January Evening Shift
40

In a metre bridge experiment the balance point is obtained if the gaps are closed by 2$$\Omega$$ and 3$$\Omega$$. A shunt of X $$\Omega$$ is added to 3$$\Omega$$ resistor to shift the balancing point by 22.5 cm. The value of X is ___________.

JEE Main 2023 (Online) 29th January Morning Shift
41

Two cells are connected between points A and B as shown. Cell 1 has emf of 12 V and internal resistance of 3$$\Omega$$. Cell 2 has emf of 6V and internal resistance of 6$$\Omega$$. An external resistor R of 4$$\Omega$$ is connected across A and B. The current flowing through R will be ____________ A.

JEE Main 2023 (Online) 25th January Evening Shift Physics - Current Electricity Question 90 English

JEE Main 2023 (Online) 25th January Evening Shift
42

In the given circuit, the equivalent resistance between the terminal A and B is __________ $$\Omega$$.

JEE Main 2023 (Online) 25th January Morning Shift Physics - Current Electricity Question 89 English

JEE Main 2023 (Online) 25th January Morning Shift
43

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.

JEE Main 2023 (Online) 24th January Evening Shift
44

A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The resistance of the conductor is $$n\times10^{-3}\Omega$$. If the resistivity of the material is $$\mathrm{2.4\times10^{-8}\Omega m}$$. The value of $$n$$ is ___________.

JEE Main 2023 (Online) 24th January Morning Shift
45

The current I flowing through the given circuit will be __________A.

JEE Main 2022 (Online) 29th July Morning Shift Physics - Current Electricity Question 113 English

JEE Main 2022 (Online) 29th July Morning Shift
46

An electrical bulb rated 220 V, 100 W, is connected in series with another bulb rated 220 V, 60 W. If the voltage across combination is 220 V, the power consumed by the 100 W bulb will be about _______ W.

JEE Main 2022 (Online) 28th July Evening Shift
47

As shown in the figure, a potentiometer wire of resistance $$20 \,\Omega$$ and length $$300 \mathrm{~cm}$$ is connected with resistance box (R.B.) and a standard cell of emf $$4 \mathrm{~V}$$. For a resistance '$$R$$' of resistance box introduced into the circuit, the null point for a cell of $$20 \,\mathrm{mV}$$ is found to be $$60 \mathrm{~cm}$$. The value of '$$R$$' is ___________ $$\Omega .$$

JEE Main 2022 (Online) 28th July Morning Shift Physics - Current Electricity Question 117 English

JEE Main 2022 (Online) 28th July Morning Shift
48

In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is $$40 \mathrm{~cm}$$. The balancing length, if the radius of the wire $$\mathrm{AB}$$ is doubled, will be ______________ $$\mathrm{cm}$$.

JEE Main 2022 (Online) 27th July Evening Shift Physics - Current Electricity Question 118 English

JEE Main 2022 (Online) 27th July Evening Shift
49

In a meter bridge experiment, for measuring unknown resistance 'S', the null point is obtained at a distance $$30 \mathrm{~cm}$$ from the left side as shown at point D. If R is $$5.6$$ $$\mathrm{k} \Omega$$, then the value of unknown resistance 'S' will be __________ $$\Omega$$.

JEE Main 2022 (Online) 27th July Morning Shift Physics - Current Electricity Question 120 English

JEE Main 2022 (Online) 27th July Morning Shift
50

A $$1 \mathrm{~m}$$ long copper wire carries a current of $$1 \mathrm{~A}$$. If the cross section of the wire is $$2.0 \mathrm{~mm}^{2}$$ and the resistivity of copper is $$1.7 \times 10^{-8}\, \Omega \mathrm{m}$$, the force experienced by moving electron in the wire is ____________ $$\times 10^{-23} \mathrm{~N}$$.

(charge on electorn $$=1.6 \times 10^{-19} \,\mathrm{C}$$)

JEE Main 2022 (Online) 27th July Morning Shift
51

A potentiometer wire of length $$300 \mathrm{~cm}$$ is connected in series with a resistance 780 $$\Omega$$ and a standard cell of emf $$4 \mathrm{V}$$. A constant current flows through potentiometer wire. The length of the null point for cell of emf $$20\, \mathrm{mV}$$ is found to be $$60 \mathrm{~cm}$$. The resistance of the potentiometer wire is ____________ $$\Omega$$.

JEE Main 2022 (Online) 26th July Evening Shift
52

Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length $$l_{1}$$ is $$40 \mathrm{~cm}$$. Now an unknown resistance $$x$$ is connected in series with $$\mathrm{P}$$ and new balancing length is found to be $$80 \mathrm{~cm}$$ measured from the same end. Then the value of $$x$$ will be ____________ $$\Omega$$.

JEE Main 2022 (Online) 26th July Morning Shift Physics - Current Electricity Question 126 English

JEE Main 2022 (Online) 26th July Morning Shift
53

In a potentiometer arrangement, a cell of emf 1.20 V gives a balance point at 36 cm length of wire. This cell is now replaced by another cell of emf 1.80 V. The difference in balancing length of potentiometer wire in above conditions will be ___________ cm.

JEE Main 2022 (Online) 25th July Evening Shift
54

In the given figure, the value of Vo will be _____________ V.

JEE Main 2022 (Online) 25th July Morning Shift Physics - Current Electricity Question 131 English

JEE Main 2022 (Online) 25th July Morning Shift
55

Eight copper wire of length $$l$$ and diameter $$d$$ are joined in parallel to form a single composite conductor of resistance $$R$$. If a single copper wire of length $$2 l$$ have the same resistance $$(R)$$ then its diameter will be ____________ d.

JEE Main 2022 (Online) 25th July Morning Shift
56

The circuit diagram of potentiometer used to measure the internal resistance of a cell (E) is shown in figure. The key 'K' is kept closed so as to send constant current through potentiometer wire. When key 'K1' is kept open the null point is found to be at 120 cm on the potentiometer wire. When the key 'K1' is closed the null point is shifted at 80 cm at the potentiometer wire. The internal resistance of the given cell is _____________ $$\Omega$$.

JEE Main 2022 (Online) 30th June Morning Shift Physics - Current Electricity Question 133 English

JEE Main 2022 (Online) 30th June Morning Shift
57

Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance 2000 $$\Omega$$ is used to measure the potential difference across 500 $$\Omega$$ resistor, the reading of the voltmeter will be ___________ V.

JEE Main 2022 (Online) 29th June Evening Shift Physics - Current Electricity Question 156 English

JEE Main 2022 (Online) 29th June Evening Shift
58

The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4 cm. The diameter of wire is measured as 2.4 cm. The resistivity of the given wire is measured as x $$\times$$ 10$$-$$3 $$\Omega$$ cm. The value of x is ____________. [Take $$\pi$$ = 3.14]

JEE Main 2022 (Online) 29th June Morning Shift Physics - Current Electricity Question 158 English

JEE Main 2022 (Online) 29th June Morning Shift
59

For the network shown below, the value of VB $$-$$ VA is ____________ V.

JEE Main 2022 (Online) 29th June Morning Shift Physics - Current Electricity Question 157 English

JEE Main 2022 (Online) 29th June Morning Shift
60

All resistances in figure are 1 $$\Omega$$ each. The value of current 'I' is $${a \over 5}$$ A. The value of a is _________.

JEE Main 2022 (Online) 28th June Evening Shift Physics - Current Electricity Question 154 English

JEE Main 2022 (Online) 28th June Evening Shift
61

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 $$\Omega$$. The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be ____________ $$\Omega$$.

JEE Main 2022 (Online) 28th June Morning Shift Physics - Current Electricity Question 151 English

JEE Main 2022 (Online) 28th June Morning Shift
62

Current measured by the ammeter (A) in the reported circuit when no current flows through 10 $$\Omega$$ resistance, will be ________________ A.

JEE Main 2022 (Online) 28th June Morning Shift Physics - Current Electricity Question 152 English

JEE Main 2022 (Online) 28th June Morning Shift
63

The current density in a cylindrical wire of radius r = 4.0 mm is 1.0 $$\times$$ 106 A/m2. The current through the outer portion of the wire between radial distances $${r \over 2}$$ and r is x$$\pi$$ A; where x is __________.

JEE Main 2022 (Online) 27th June Evening Shift
64

In the given circuit 'a' is an arbitrary constant. The value of m for which the equivalent circuit resistance is minimum, will be $$\sqrt {{x \over 2}} $$. The value of x is __________.

JEE Main 2022 (Online) 27th June Evening Shift Physics - Current Electricity Question 149 English

JEE Main 2022 (Online) 27th June Evening Shift
65

A cell, shunted by a 8 $$\Omega$$ resistance, is balanced across a potentiometer wire of length 3 m. The balancing length is 2 m when the cell is shunted by 4 $$\Omega$$ resistance. The value of internal resistance of the cell will be ____________ $$\Omega$$.

JEE Main 2022 (Online) 27th June Morning Shift
66

The current density in a cylindrical wire of radius 4 mm is 4 $$\times$$ 106 Am$$-$$2. The current through the outer portion of the wire between radial distances $${R \over 2}$$ and R is ____________ $$\pi$$ A.

JEE Main 2022 (Online) 27th June Morning Shift
67

The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be ____________ %.

JEE Main 2022 (Online) 25th June Evening Shift
68

A resistor develops 300 J of thermal energy in 15 s, when a current of 2 A is passed through it. If the current increases to 3 A, the energy developed in 10 s is ____________ J.

JEE Main 2022 (Online) 25th June Morning Shift
69

The total current supplied to the circuit as shown in figure by the 5 V battery is ____________ A.

JEE Main 2022 (Online) 25th June Morning Shift Physics - Current Electricity Question 139 English

JEE Main 2022 (Online) 25th June Morning Shift
70

A potentiometer wire of length 10 m and resistance 20 $$\Omega$$ is connected in series with a 25 V battery and an external resistance 30 $$\Omega$$. A cell of emf E in secondary circuit is balanced by 250 cm long potentiometer wire. The value of E (in volt) is $${x \over {10}}$$. The value of x is __________.

JEE Main 2022 (Online) 24th June Evening Shift
71

In a potentiometer arrangement, a cell gives a balancing point at 75 cm length of wire. This cell is now replaced by another cell of unknown emf. If the ratio of the emf's of two cells respectively is 3 : 2, the difference in the balancing length of the potentiometer wire in above two cases will be ___________ cm.

JEE Main 2022 (Online) 24th June Morning Shift
72
A uniform heating wire of resistance 36$$\Omega$$ is connected across a potential difference of 240 V. The wire is then cut into half and potential difference of 240V is applied across each half separately. The ratio of power dissipation in first case to the total power dissipation in the second case would be 1 : x, where x is ____________
JEE Main 2021 (Online) 1st September Evening Shift
73
A resistor dissipates 192 J of energy in 1s when a current of 4A is passed through it. Now, when the current is doubled, the amount of thermal energy dissipated in 5s in _________ J.
JEE Main 2021 (Online) 31st August Evening Shift
74
A square shaped wire with resistance of each side 3$$\Omega$$ is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of $$\Omega$$ will be ___________.
JEE Main 2021 (Online) 31st August Morning Shift
75
The voltage drop across 15$$\Omega$$ resistance in the given figure will be ______________ V.

JEE Main 2021 (Online) 31st August Morning Shift Physics - Current Electricity Question 164 English
JEE Main 2021 (Online) 31st August Morning Shift
76
The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x : 8. The value of x is ___________.

JEE Main 2021 (Online) 27th August Evening Shift Physics - Current Electricity Question 168 English
JEE Main 2021 (Online) 27th August Evening Shift
77
First, a set of n equal resistors of 10 $$\Omega$$ each are connected in series to a battery of emf 20V and internal resistance 10$$\Omega$$. A current I is observed to flow. Then, the n resistors are connected in parallel to the same battery. It is observed that the current is increased 20 times, then the value of n is ............... .
JEE Main 2021 (Online) 27th August Morning Shift
78
For the circuit shown, the value of current at time t = 3.2 s will be _________ A.

JEE Main 2021 (Online) 27th July Evening Shift Physics - Current Electricity Question 177 English
[Voltage distribution V(t) is shown by Fig. (1) and the circuit is shown in Fig. (2)]
JEE Main 2021 (Online) 27th July Evening Shift
79
A 16 $$\Omega$$ wire is bend to form a square loop. A 9V supply having internal resistance of 1$$\Omega$$ is connected across one of its sides. The potential drop across the diagonals of the square loop is _______________ $$\times$$ 10$$-$$1 V
JEE Main 2021 (Online) 25th July Evening Shift
80
An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the bulb so that the bulb delivers the same power is _____________ $$\Omega$$.
JEE Main 2021 (Online) 25th July Morning Shift
81
In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5$$\Omega$$. However, it provides a potential difference of 1 V across a load resistance of 2$$\Omega$$. The emf of the cell is given by $${x \over {10}}V$$. Then the value of x is ______________.
JEE Main 2021 (Online) 22th July Evening Shift
82
In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is _____________ $$\Omega$$.

JEE Main 2021 (Online) 20th July Evening Shift Physics - Current Electricity Question 186 English
JEE Main 2021 (Online) 20th July Evening Shift
83
Two wires of same length and thickness having specific resistances 6$$\Omega$$ cm and 3$$\Omega$$ cm respectively are connected in parallel. The effective resistivity is $$\rho$$$$\Omega$$ cm. The value of $$\rho$$, to the nearest integer, is ____________.
JEE Main 2021 (Online) 18th March Evening Shift
84
Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance x cm from A. The galvanometer shows zero deflection.

JEE Main 2021 (Online) 18th March Evening Shift Physics - Current Electricity Question 190 English
The value of x, to the nearest integer, is ___________.
JEE Main 2021 (Online) 18th March Evening Shift
85
The voltage across the 10$$\Omega$$ resistor in the given circuit is x volt.

JEE Main 2021 (Online) 18th March Morning Shift Physics - Current Electricity Question 191 English
The value of 'x' to the nearest integer is _________.
JEE Main 2021 (Online) 18th March Morning Shift
86
The equivalent resistance of series combination of two resistors is 's'. When they are connected in parallel, the equivalent resistance is 'p'. If s = np, then the minimum value for n is ____________. (Round off to the Nearest Integer)
JEE Main 2021 (Online) 17th March Morning Shift
87
The energy dissipated by a resistor is 10 mJ in 1 s when an electric current of 2 mA flows through it. The resistance is ___________$$\Omega$$. (Round off to the Nearest Integer)
JEE Main 2021 (Online) 16th March Evening Shift
88
In the figure given, the electric current flowing through the 5 k$$\Omega$$ resistor is 'x' mA.

JEE Main 2021 (Online) 16th March Morning Shift Physics - Current Electricity Question 199 English
The value of x to the nearest integer is ____________.
JEE Main 2021 (Online) 16th March Morning Shift
89
In an electrical circuit, a battery is connected to pass 20C of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at 15V. The workdone by the battery is __________J.
JEE Main 2021 (Online) 26th February Morning Shift
90
A current of 6A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2$$\Omega$$ each and leaves by the corner R. The currents i1 in ampere is _________.

JEE Main 2021 (Online) 25th February Evening Shift Physics - Current Electricity Question 204 English
JEE Main 2021 (Online) 25th February Evening Shift
91
In the given circuit of potentiometer, the potential difference E across AB (10 m length) is larger than E1 and E2 as well. For key K1 (closed), the jockey is adjusted to touch the wire at point J1 so that there is no deflection in the galvanometer. Now the first battery (E1) is replaced by second battery (E2) for working by making K1 open and K2 closed. The galvanometer gives then null deflection at J2. The value of $${{{E_1}} \over {{E_2}}}$$ is $${a \over b}$$, where a = _________.

JEE Main 2021 (Online) 25th February Morning Shift Physics - Current Electricity Question 205 English
JEE Main 2021 (Online) 25th February Morning Shift
92
A cylindrical wire of radius 0.5 mm and conductivity 5 $$\times$$ 107 S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be x3$$\pi$$ mA. The value of x is _________.
JEE Main 2021 (Online) 24th February Evening Shift
93
Four resistances 40 $$\Omega $$, 60 $$\Omega $$, 90 $$\Omega $$ and 110 $$\Omega $$ make the arms of a quadrilateral ABCD. Across AC is a battery of emf 40 V and internal resistance negligible.The potential difference across BD in V is _______. JEE Main 2020 (Online) 4th September Evening Slot Physics - Current Electricity Question 215 English
JEE Main 2020 (Online) 4th September Evening Slot
94
In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is $$l$$ = 25 cm. If R is replaced by a wire of half length and half diameter that of R of same material, then the balancing distance $$l'$$ (in cm) will now be________. JEE Main 2020 (Online) 9th January Evening Slot Physics - Current Electricity Question 222 English
JEE Main 2020 (Online) 9th January Evening Slot
95
The series combination of two batteries, both of the same emf 10 V, but different internal resistance of 20$$\Omega $$ and 5$$\Omega $$, is connected to the parallel combination of two resistors 30$$\Omega $$ and R $$\Omega $$. The voltage difference across the battery of internal resistance 20$$\Omega $$ is zero, the value of R (in $$\Omega $$) is : _______
JEE Main 2020 (Online) 8th January Evening Slot
96
Four resistances of 15$$\Omega $$, 12$$\Omega $$, 4$$\Omega $$ and 10$$\Omega $$ respectively in cyclic order to form Wheatstone's network. The resistance that is to be connected in parallel with the resistance of 10$$\Omega $$ to balance the network is _____$$\Omega $$.
JEE Main 2020 (Online) 8th January Morning Slot
97
The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10 $$\Omega $$ is connected in parallel to the cell, the balancing length changes by 60 cm. If the internal resistance of the ceil is $${N \over {10}}$$ $$\Omega $$ , where N is an integer then value of N is .............
JEE Main 2020 (Online) 7th January Evening Slot
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