﻿ Important Questions of Electrostatic Potential and Capacitance Physics | Zigya

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## Physics : Electrostatic Potential and Capacitance

#### Multiple Choice Questions

11.

A thin semi–circular ring of radius r has a positive charge q distributed uniformly over it. The net field at the center O is • • • • 797 Views

12.

An electric dipole has a fixed dipole moment , which makes angle θ with respect to the x-axis. When subjected to an electric field , it experiences a torque . When subjected to another electric field it experiences torque . The angle θ is

• 60°

• 90°

• 30°

• 30°

1136 Views

13.

In the given circuit diagram when the current reaches steady state in the circuit, the charge on the capacitor of capacitance C will be : • • • CE

• CE

792 Views

14.

A capacitance of 2 μF is required in an electrical circuit across a potential difference of 1.0 kV. A large number of 1 μF capacitors are available which can withstand a potential difference of not more than 300 V. The minimum number of capacitors required to achieve this is :

• 24

• 32

• 2

• 2

324 Views

15.

This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement – 1: For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q.
Statement-2: The net work done by a conservative force on an object moving along a closed loop is zero.

• Statement-1 is true, Statement-2 is false

• Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.

• Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.

• Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.

138 Views

16.

A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other tow corners. If the net electrical force on Q is zero, then Q/q equals

• • 1

• -1

• -1

204 Views

17.

A parallel plate capacitor with air between the plates has a capacitance of 9 pF. The separation between its plates is ‘d’. The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant k1 = 3 and thickness d/3 while the other one has dielectric constant k2 = 6 and thickness 2d/3 . Capacitance of the capacitor is now

• 1.8 pF

• 45 pF

• 40.5 pF

• 40.5 pF

162 Views

18.

An electric charge 10-3 µC is placed at the origin (0,0) of X - Y coordinate system. Two points A and B are situated at and (2, 0) respectively. The potential difference between the points A and B will be

• 9 volt

• 0 volt

• 2 volt

• 2 volt

287 Views

19.

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be

• 1

• 2

• 1/4

• 1/4

146 Views

20.

A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

• ½ (K – 1) CV2

• CV2 (K – 1) /K

• (K –1) CV2

• (K –1) CV2

183 Views