﻿ Medical Entrance Exam Question and Answers | Electrostatic Potential and Capacitance - Zigya

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# Electrostatic Potential and Capacitance

#### Multiple Choice Questions

1.

A capacitor of 2 is charged as shown in the figure. When the switch s is turned to position 2, the percentage of its stored energy dissipated is, • 20%

• 75%

• 80%

• 80%

4628 Views

2.

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of a dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. which of the following is incorrect?

• The potential difference between the plates decreases K times

• The energy stored in the capacitor decreases K times

• The change in energy stored is • The change in energy stored is 1585 Views

3.

A potentiometer wire has length 4 m and resistance 8Ω. The resistance that must be connected in series with the wire and an accumulator of emf 2V, so as to get a potential gradient 1mV per cm on the wire is

• 32Ω

• 40Ω

• 44Ω

• 44Ω

4473 Views

4.

Across a metallic conductor of non-uniform cross -section, a constant potential difference is applied. The quantity which remains constant along the conductor is

• Current density

• Current

• drift velocity

• drift velocity

1784 Views

5.

A parallel plate capacitor has a uniform electrinc field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy storedf in the capacitor is df and area of each plate  is A, the energy stored in the capacitor is

• • • • 342 Views

6.

Two metallic spheres of radii 1 cm and 3 cm are given charges of (-1 x 10-2 C) and 5 x 10-2 C , respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

• 2 x 10-2 C

• 3 x 10-2 C

• 4 x 10-2 C

• 4 x 10-2 C

2392 Views

7.

The potential energy of a particle in a force field is, where A and B are positive constants are r is the distance of a particle from the centre of the field. For stable equilibrium, the distance of a particle is

• B/2A

• 2A/B

• A/B

• A/B

534 Views

8.

Four point charge -Q,-q,2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is

• Q= -q

• Q=-1/q

• Q=q

• Q=q

1496 Views

9.

A, B and C are three points in a uniform electric field. The electric potential is E
• Maximum at A

• Maximum at B

• Maximum at C

• Maximum at C

1493 Views

10.

A parallel plate condenser has a uniform electric field E (V/m) in the space between the plates. If the distance between the plates is d(m) and area of each plate is A(m2) the energy (joule) stored in the condenser is

• • • • 557 Views