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Question (1)

QN0038960

If the charge on a capacitor is increased by , the energy stored in it increases by . The original charge on the capacitor is (in ):

(A)
10
(B)
20
(C)
30
(D)
40

Correct Answer: A

Explanation:

. As C constant,

So,

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Question (2)

QN0038961

A conductor carries a certain charge. When it is connected to another uncharged conductor of finite capacity, then the energy of the combined system is

(A)
more than that of the first conductor
(B)
less than that of the first conductor
(C)
equal to that of the first conductor
(D)
uncertain

Correct Answer: B

Explanation:

Energy will be lost during transfer of charge (heating effect).

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Question (3)

QN0038962

The energy stored in a condenser of capacity which has been raised to a potential is given by

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (4)

QN0038963

The work done in placing a charge of coulomb on a condenser of capacity 100 micro-farad is

(A)
joule
(B)
joule
(C)
joule
(D)
joule

Correct Answer: C

Explanation:

Work done

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Question (5)

QN0038964

A parallel plate capacitor is charged by connecting it to a battery. Now the distance between the plates of the capacitor is increased. Which of the following remains constant?

(A)
Capacitance
(B)
Charge on each plate of the capacitor
(C)
Potential difference between the plates of capacitor
(D)
Energy stored in the capacitor

Correct Answer: C

Explanation:

As the capacitor remains connected to the battery, the potential difference provided by the battery remains constant.

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Question (6)

QN0038965

Two parallel plate capacitors and , have the same area of plates and same separation between plates. has air and with dielectric of constant 2 . between its plates. They are connected in series to a battery of . The ratio of electrostatic energy stored in and is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (7)

QN0038966

A capacitor has two circular plates whose radius are and distance between them is . When mica (dielectric constant ) is placed between the plates, the capacitance of this capacitor and the energy stored when it is given potential of 150 volt respectively are

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

Area of plate

Capacity of capacitor

Potential difference, volt

Energy stored,

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Question (8)

QN0038967

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

(A)
The energy stored in the capacitor decreases times.
(B)
The chance in energy stored is .
(C)
The charge on the capacitor is not conserved.
(D)
The potential difference between the plates decreases times.

Correct Answer: C

Explanation:

Electrostatic Potential and Capacitance

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Question (9)

QN0038968

A condenser of capacitance is charged steadily from 0 to . Which of the following graph represents correctly the variation of potential difference across it's plates with respect to the charge on the condenser?

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

. so, graph will be straight line between and .

Now,

.

So, most suitable option is (a).

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Question (1)

If the charge on a capacitor is increased by , the energy stored in it increases by . The original charge on the capacitor is (in ):

Explanation:

Link:

Question (2)

A conductor carries a certain charge. When it is connected to another uncharged conductor of finite capacity, then the energy of the combined system is

Explanation:

Link:

Question (3)

The energy stored in a condenser of capacity which has been raised to a potential is given by

Explanation:

Link:

Question (4)

The work done in placing a charge of coulomb on a condenser of capacity 100 micro-farad is

Explanation:

Link:

Question (5)

A parallel plate capacitor is charged by connecting it to a battery. Now the distance between the plates of the capacitor is increased. Which of the following remains constant?

Explanation:

Link:

Question (6)

Two parallel plate capacitors and , have the same area of plates and same separation between plates. has air and with dielectric of constant 2 . between its plates. They are connected in series to a battery of . The ratio of electrostatic energy stored in and is

Explanation:

Link:

Question (7)

A capacitor has two circular plates whose radius are and distance between them is . When mica (dielectric constant ) is placed between the plates, the capacitance of this capacitor and the energy stored when it is given potential of 150 volt respectively are

Explanation:

Link:

Question (8)

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

Explanation:

Link:

Question (9)

A condenser of capacitance is charged steadily from 0 to . Which of the following graph represents correctly the variation of potential difference across it's plates with respect to the charge on the condenser?

Explanation:

Link:

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