A parallel plate capacitor is charged by a battery of emf $V$ volts. Work done by battery is $W .$ Gain in energy of capacitor is $U$ and heat dissipated in lead wires is $H .$ Then

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Important Questions on Electrostatic Potential and Capacitance

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JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 16 - Electrostatic Potential and Capacitance>EXERCISE 2.5>Q 52

A capacitor of capacitance

C

is charged to a potential difference

V

from a cell and then disconnected from it. A charge

+ Q

is now given to its positive plate. The potential difference across the capacitor is now

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Gamma Question Bank for Engineering Physics>Chapter 16 - Electrostatic Potential and Capacitance>EXERCISE 2.5>Q 53

A charge of

1 μ C

is given to one plate of a parallel plate capacitor of capacitance

0.1 μ F

and a charge of

2 μ C

is given to the other plate. Find the potential difference developed between the plates.

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JEE Main/Advance

IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 16 - Electrostatic Potential and Capacitance>EXERCISE 2.5>Q 54

A parallel plate air capacitor is to be constructed which can store

12 μ C

of charge when operated at

1200 V .

If dielectric strength of air is

3 \times 10^{6} V m^{- 1},

the minimum plate area of the capacitor required is

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IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 16 - Electrostatic Potential and Capacitance>EXERCISE 2.5>Q 55

Plate $A$ of a parallel plate air filled capacitor is connected to a spring having force constant $' K$ and plate $B$ is fixed. They rest on a frictionless table top as shown in figure. If $+ q$ and $- q$ charges are given to $A$ and $B$ very slowly then elongation in spring will be