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If the plates of the capacitor are moved further apart by means of insulating handles. A parallel plate capacitor is charged and the charging battery is then disconnected.

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Important Questions on Capacitance and Capacitors

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 46

Two parallel plate capacitors of capacitance

C

and

2 C

are connected in parallel and charged to a potential difference

V

by the battery. The battery is then disconnected and the space between the plates of capacitor of capacitance

C

is completely filled with a material of dielectric constant

K

. The potential difference across the capacitors now becomes

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 47

A parallel plate capacitor of value

1.77 μ F

is to be designed using a dielectric material (dielectric constant

200

, breaking strength of

3 \times 10^{6} {Vm}^{- 1})

. In order to make such a capacitor, which can withstand a potential difference of

20 V

Across the plates, the separation

d

Between the plates and the area

A

of the plates can be

(ε_{0} = 8.85 \times 10^{- 12} C^{2} N^{- 1} m^{- 2})

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IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 48

A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is now disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is:

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 49

For the circuit shown in figure, which of the following statements is true ?

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12th West Bengal Board

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 50

A parallel plate capacitor of area A, plate separation

d

and capacitance

C

is filled with three different dielectric materials having dielectric constants

k_{1}, k_{2}

and

k_{3}

as shown in figure. If a single dielectric material is to be used to have the same capacitance

C

in this capacitor, then the dielectric constant

k

is given by

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 51

Consider the situation shown in the figure. The capacitor $A$ has a charge $q$ on it whereas $B$ is uncharged. The charge appearing on the capacitor $B$ a long time after the switch is closed is

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 52

Two identical capacitors have the same capacitance $C .$ The negative ends of the capacitors are connected together. One of them is charged to potential $V_{1}$ and the other $V_{2}$ . When the positive ends are also connected, the decreases in energy of the combined system is

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 4 - Capacitance and Capacitors>EXERCISE 4>Q 53

Four metal plates numbered $1, 2, 3$ and 4 are arranged as shown in Figure.The area of each plate is $A$ and the separation between adjacent plate is $d$ . The capacitance of the arrangement is

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If the plates of the capacitor are moved further apart by means of insulating handles. A parallel plate capacitor is charged and the charging battery is then disconnected.

Important Questions on Capacitance and Capacitors

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