JEE Main 2020 (Online) 8th January Morning Slot | Current Electricity Question 206 | Physics

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 :

80$$\Omega $$

60$$\Omega $$

120$$\Omega $$

100$$\Omega $$

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

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 :

15 A

20 A

25 A

10 A

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

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 210 English

JEE Main 2020 (Online) 7th January Morning Slot Physics - Current Electricity Question 210 English

0.4

0.25

0.2

0.5

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

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 > I_g) by connecting a shunt resistance R_A to it and (ii) into a voltmeter of range 0 to V (V = GI₀) by connecting a series resistance R_V to it. Then,

$${R_A}{R_V} = {G^2}$$ and $${{{R_A}} \over {{R_V}}} = {{{I_g}} \over {\left( {{I_0} - {I_g}} \right)}}$$

$${R_A}{R_V} = {G^2}\left( {{{{I_g}} \over {{I_0} - {I_g}}}} \right)$$ and $${{{R_A}} \over {{R_V}}} = {\left( {{{{I_0} - {I_g}} \over {{I_g}}}} \right)^2}$$

$${R_A}{R_V} = {G^2}\left( {{{{I_0} - {I_g}} \over {{I_g}}}} \right)$$ and $${{{R_A}} \over {{R_V}}} = {\left( {{{{I_g}} \over {{I_0} - {I_g}}}} \right)^2}$$

$${R_A}{R_V} = {G^2}$$ and $${{{R_A}} \over {{R_V}}} = {\left( {{{{I_g}} \over {{I_0} - {I_g}}}} \right)^2}$$

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