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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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Important Questions on Capacitance

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 14

In the adjoining figure, capacitor

(1)

and

(2)

have a capacitance '

C

' each. When the dielectric of dielectric constant

K

is inserted between the plates of one of the capacitor, the total charge flowing through battery is-

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 18

A capacitor

C

is charged to a potentials difference

V

and battery is disconnected. Now if the capacitor plates are brought close slowly by some distance

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 19

A parallel plate capacitor of plate area

A

and plate separation

d

is charged to potential difference

V

and then the battery is disconnected. A slab of dielectric constant

K

is then inserted between the plates of the capacitor so as to fill the space between the plates. If

Q, E

and

W

denote respectively, the magnitude of charge on each plate, the electric field between the plates (after the slab is inserted) and the work done on the system, in question, in the process of inserting the slab, then

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 20

Two capacitors of equal capacitance

(C_{1} = C_{2})

are shown in the figure. Initially, while the switch

S

is open, one of the capacitors is uncharged and the other carries charge

Q_{0}

. The energy stored in the charged capacitor is

U_{0}

. Sometimes after the switch is closed, the capacitors

C_{1}

and

C_{2}

carry charges

Q_{1}

and

Q_{2}

, respectively; the voltage across the capacitors are

V_{1}

and

V_{2}

; and the energies stored in the capacitors are

U_{1}

and

U_{2}

. Which of the following statements is incorrect ?

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 21

Two thin conducting shells of radii

R

and

3 R

are shown in the figure. The outer shell carries a charge

+ Q

and the inner shell is neutral. The inner shell is earthed with the help of a switch

S

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Beta Question Bank for Engineering: Physics>Chapter 23 - Capacitance>Exercise-2>Q 22

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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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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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

Important Questions on Capacitance

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