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Question (1)

QN0038879

The electric potential inside a conducting sphere

(A)
increases from centre to surface
(B)
decreases from centre to surface
(C)
remains constant from centre to surface
(D)
is zero at every point inside

Correct Answer: C

Explanation:

Electric potential inside a conductor is constant and it is equal to that on the surface of the conductor.

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Question (2)

QN0038880

It becomes possible to define potential at a point in an electric field because electric field

(A)
is a conservative field
(B)
is a non-conservative field
(C)
is a vector field
(D)
obeys principle of superposition

Correct Answer: A

Explanation:

Potential energy is defined only in case of conservative forces like electrostatic force (and due to which electrostatic field is a conservative field). It is not defined for non-conservative forces like friction

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Question (3)

QN0038881

Which of the following about potential at a point due to a given point charge is true ? The potential at a point due to a given point charge

(A)
is a function of distance from the point charge.
(B)
varies inversely as the square of distance from the point charge.
(C)
is a vector quantity
(D)
is directly proportional to the square of distance from the point charge.

Correct Answer: A

Explanation:

Since , for a given point charge, is constant, therefore depends only on . Hence is a function of distance.

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Question (4)

QN0038882

A, B and C are three points in a uniform electric field. The electric potential is

(A)
maximum at
(B)
maximum at
(C)
same at all the three points A, B and C
(D)
maximumat

Correct Answer: A

Explanation:

Potential at is maximum,

As in the direction of electric field potential decreases.

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Question (5)

QN0038883

The figure shows the electric dipole placed along -axis. As we move from point to point potential changes from

(A)
positive to negative
(B)
negative to positive
(C)
positive to zero
(D)
does not change

Correct Answer: B

Explanation:

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Question (6)

QN0038884

and are two points in an electric field. If the work done in carrying of electric charge from to is , the potential difference between and is

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

Correct Answer: C

Explanation:

Since

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Question (7)

QN0038885

Two points and are maintained at the potentials of 10 and , respectively. The work done in moving 100 electrons from to is:

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

Correct Answer: C

Explanation:

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Question (8)

QN0038886

A ball of mass carrying a charge moves from a point at potential to a point at zero potential. The change in its K.E. is

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

Correct Answer: C

Explanation:

As work is done by the field, K.E. of the body increases by K.E.

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Question (9)

QN0038887

A point charge is kept at the centre of metallic insulated spherical shell. Then

(A)
electric field out side the sphere is zero
(B)
electric field inside the sphere is zero
(C)
net induced charge on the sphere is zero
(D)
electric potential inside the sphere is zero

Correct Answer: C

Explanation:

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Question (10)

QN0038888

Which of the following quantities do not depend on the choice of zero potential or zero potential energy?

(A)
Potential at a point
(B)
Potential difference between two points
(C)
Potential energy of a two-charge system
(D)
None of these

Correct Answer: B

Explanation:

Potential difference between two points is independent of zero potential or zero potential energy.

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Question (1)

The electric potential inside a conducting sphere

Explanation:

Link:

Question (2)

It becomes possible to define potential at a point in an electric field because electric field

Explanation:

Link:

Question (3)

Which of the following about potential at a point due to a given point charge is true ? The potential at a point due to a given point charge

Explanation:

Link:

Question (4)

A, B and C are three points in a uniform electric field. The electric potential is

Explanation:

Link:

Question (5)

The figure shows the electric dipole placed along -axis. As we move from point to point potential changes from

Explanation:

Link:

Question (6)

and are two points in an electric field. If the work done in carrying of electric charge from to is , the potential difference between and is

Explanation:

Link:

Question (7)

Two points and are maintained at the potentials of 10 and , respectively. The work done in moving 100 electrons from to is:

Explanation:

Link:

Question (8)

A ball of mass carrying a charge moves from a point at potential to a point at zero potential. The change in its K.E. is

Explanation:

Link:

Question (9)

A point charge is kept at the centre of metallic insulated spherical shell. Then

Explanation:

Link:

Question (10)

Which of the following quantities do not depend on the choice of zero potential or zero potential energy?

Explanation:

Link:

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