Physics
Current Electricity
Previous Years Questions

## Numerical

Two resistances $R_{1}=X \Omega$ and $R_{2}=1 \Omega$ are connected to a wire $A B$ of uniform resistivity, as shown in the figure. The radius of the ...
In the following circuit $C_{1}=12 \mu F, C_{2}=C_{3}=4 \mu F$ and $C_{4}=C_{5}=2 \mu F$. The charge stored in $C_{3}$ is ____________ $\mu C$. ...
In order to measure the internal resistance r1 of a cell of emf E, a meter bridge of wire resistance R0 = 50$$\Omega$$, a resistance R0/2, another cel...
In the circuit shown below, the switch S is connected to position P for a long time so that the charge on the capacitor becomes q1 $$\mu$$C. Then S is...
In the circuit shown below, the switch S is connected to position P for a long time so that the charge on the capacitor becomes q1 $$\mu$$C. Then S is...
Two large circular discs separated by a distance of 0.01 m are connected to a battery via a switch as shown in the figure. Charged oil drops of densit...
A point charge q of mass m is suspended vertically by a string of length l. A point dipole of dipole moment $$\overrightarrow p$$ is now brought towa...
In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance R3 has ...
Two capacitors with capacitance values C1 = 2000 $$\pm$$ 10 pF and C2 = 3000 $$\pm$$ 15 pF are connected in series. The voltage applied across thi...
A circular disc of radius R carries surface charge density $$\sigma \left( r \right) = {\sigma _0}\left( {1 - {r \over R}} \right)$$, where $$\sigma ... In the following circuit, the current through the resistor R(=2$$\Omega$$) is I amperes. The value of I is : ... A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a 4990$$\Omega$$resistance, it can be converted into a voltmete... Two batteries of different emfs and different internal resistance are connected as shown. The voltage across AB in volts is __________. ... When two identical batteries of internal resistance 1$$\Omega$$each are connected in series across a resistor R, the rate of heat produced in R is J... ## MCQ (More than One Correct Answer) In Circuit-1 and Circuit- 2 shown in the figures, R_{1}=1 \,\Omega, R_{2}=2 \,\Omega and R_{3}=3 \,\Omega. P_{1} and P_{2} are the power diss... A medium having dielectric constant K>1 fills the space between the plates of a parallel plate capacitor. The plates have large area, and the dis... The figure shows a circuit having eight resistances of 1 \Omega each, labelled R_{1} to R_{8}, and two ideal batteries with voltages \varepsilo... Two identical non-conducting solid spheres of same mass and charge are suspended in air from a common point by two non-conducting, massless strings of... A uniform electric field,$$\overrightarrow E = - 400\sqrt 3 \widehat y$$NC−1 is applied in a region. A charged particle of mass m carrying positiv... Shown in the figure is a semicircular metallic strip that has thickness t and resistivity$$\rho $$. Its inner radius is R1 and outer radius is R2. If... In the circuit shown, initially there is no charge on the capacitors and keys S1 and S2 are open. The values of the capacitors are C1 = 10$$\mu $$F, C... A charged shell of radius R carries a total charge Q. Given$$\phi $$as the flux of electric field through a closed cylindrical surface of height h, ... Two identical moving coil galvanometers have 10$$\Omega $$resistance and full scale deflection at 2$$\mu $$A current. One of them is converted into a... Consider two identical galvanometers and two identical resistors with resistance R. If the internal resistance of the galvanometers Rc < R/2, which... In the circuit shown below, the key is pressed at time t = 0. Which of the following statement(s) is (are) true? ... An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. The hot filament emits black-b... A parallel plate capacitor having plates of area S and plate separation d, has capacitance C1 in air. When two dielectrics of different relative permi... In an aluminium (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure. The electrical resist... Two ideal batteries of emf V1 and V2 and three resistances R1, R2 and R3 are connected as shown in the figure. The current in resistance R2 would be z... In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance$$C.$$The switch$${S_1}$$is pressed first to fully ... Six point charges are kept at the vertices of a regular hexagon of side$$L$$and center$$O,$$as shown in the figure. Given that$$K = {1 \over {4\p...
For the resistance network shown in the figure, choose the correct option(s). ...

During an experiment with a metre bridge, the galvanometer shall a null point when the jockey is pressed at 40.0 cm using a standard resistance of 90$... If the direct transmission method with a cable of resistance 0.4 $$\Omega$$ km$$-$$1 is used, the power dissipation (in %) during transmission is... In the method using the transformers, assume that the ratio of the number of turns in the primary to that in the secondary in the step-up transformer ... In the given circuit, a charge of $$+80$$ $$\mu C$$ is given to the upper plate of the $$4$$ $$\mu F$$ capacitor. Then in the steady state, the charge... Two large vertical and parallel metal plates having a separation of $$1$$ $$cm$$ are connected to a $$DC$$ voltage source of potential difference $$X... A$$2\mu F$$capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch$$S$$is turned to pos... A meter bridge is set up as shown, to determine an unknown resistance X using a standard 10$$\Omega$$resistor. The galvanometer shows null point whe... Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temper... To verify Ohm's law, a student is provided with a test resitor RT, a high resistance R1, a small resistance R2, two identical galvanometers G1 and G2,... Consider a thin square sheet of side L and thickness, made of a material of resistivity$$\rho$\$. The resistance between two opposite faces, shown by ...