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In the figure a capacitor of capacitance $2 μF$ is connected to a cell of emf $20$ volt. The plates of the capacitor are drawn apart slowly to double the distance between them, The work done by the external agent on the plates is :

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Important Questions on Capacitance

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 23

An uncharged capacitor having capacitance

C

is connected across a battery of emf

V

. Now, the capacitor is disconnected and then, reconnected across the same battery but with reversed polarity. Which of the statement is incorrect?

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 24

Two insulating plates are both uniformly charged in such a way that the potential difference between them is

V_{2} - V_{1} = 20 V

. (i.e., plate

2

is at a higher potential). The plates are separated by

d = 0.1 m

, and can be treated as infinitely large. An electron is released from rest on the inner surface of plate

1

. What is its speed when it hits plate

2

(e = 1.6 \times 10^{- 19} C, m_{e} = 9.11 \times 10^{- 31} kg)

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 25

The distance between plates of a parallel plate capacitor is

5 d

. The positively charged plate is at

x = 0

and negatively charged plates is at

x = 5 d

. Two slabs one of conductor and the other of a dielectric

(K)

of same thickness

d

are inserted between the plates as shown in figure. Potential

(V)

versus distance

x

graph will be

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 26

In the given circuit, all the capacitors are initially uncharged. After closing the switch

S_{1}

for a long time suddenly

S_{2}

is also closed and kept closed for a long time. Total heat produced after closing

S_{2}

will be :

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 27

A conducting body

1

has some initial charge

Q

, and its capacitance is

C

. There are two other conducting bodies,

2

and

3

, having capacitance :

C_{2} = 2 C

and

C_{3} \to \infty

. Bodies

2

and

3

are initially uncharged. Body

2

is touched with body

1

. Then, body

2

is removed from body

1

and touched with body

3

, and then removed. This process is repeated for

N

times. Then, the charge on body

1

at the end must be :

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 28

A capacitor of capacitance

C

is initially charged to a potential difference of

V volt

. Now, it is connected to a battery of

2 V

with opposite polarity. The ratio of heat generated to the final energy stored in the capacitor will be

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-3>Q 6

Assertion: The capacitance of a capacitor depends on the shape, size and geometrical placing of the conductors and its medium between them.

Reason: When a charge $q$ passes through a battery of emf $E$ from the negative terminal to an positive terminal, an amount $q E$ of work is done by the battery.

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-3>Q 13

400 μF

condenser is charged at the steady rate of

100 μC

per second. The time required to establish a potential difference of

100

volt between its plates will be

N \times 10^{2}

. Find the value of

N

In the figure a capacitor of capacitance 2μF is connected to a cell of emf 20 volt. The plates of the capacitor are drawn apart slowly to double the distance between them, The work done by the external agent on the plates is :

Important Questions on Capacitance

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In the figure a capacitor of capacitance $2 μF$ is connected to a cell of emf $20$ volt. The plates of the capacitor are drawn apart slowly to double the distance between them, The work done by the external agent on the plates is :