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Question (1)

QN0038897

A unit charge moves on an equipotential surface from a point to point , then

(A)
(B)
(C)
(D)
it is stationary

Correct Answer: B

Explanation:

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Question (2)

QN0038898

In moving from to along an electric field line, the work done by the electric field on an electron is . If and are equipotential surfaces, then the potential difference is

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

Correct Answer: B

Explanation:

or

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Question (3)

QN0038899

Which of the following figure shows the correct equipotential surfaces of a system of
two positive charges?

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

Correct Answer: C

Explanation:

Equipotential surfaces are normal to the electric field lines. The following figure shows the equipotential surfaces along with electric field lines for a system of two positive charges.

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Question (4)

QN0038900

Which of the following is NOT the property of equipotential surface?

(A)
They do not cross each other.
(B)
The rate of change of potential with distance on them is zero
(C)
For a uniform electric field they are concentric spheres.
(D)
They can be imaginary spheres.

Correct Answer: C

Explanation:

As all other statements are correct. In uniform electric field equipotential surfaces are never concentric spheres but are planes to Electric field lines.

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Question (5)

QN0038901

Equipotential surfaces are shown in figure. Then the electric field strength will be

(A)
along -axis
(B)
along -axis
(C)
at an angle with -axis
(D)
at an angle with -axis

Correct Answer: C

Explanation:

Using

Direction of be perpendicular to the equipotential surface i.e. at with -axis.

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Question (6)

QN0038902

The potential at a point (measured in ) due to some charges situated on the -axis is given by volt. The electric field at is given by

(A)
and in the direction
(B)
volt/ and in the direction
(C)
and in the +ve direction
(D)
volt and in the direction

Correct Answer: A

Explanation:

Here, volt

We know that

or,

At ,

volt .

Positive sign indicates that is in +ve -direction.

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Question (7)

QN0038903

The expression implies, that electric field is in that direction in which

(A)
increase in potential is steepest.
(B)
decrease in potential is steepest.
(C)
change in potential is minimum.
(D)
None of these

Correct Answer: B

Explanation:

As we move towards a positive charge distribution increases i.e., is positive. The increase in potential is steepest when we move exactly towards charge distribution. But is in a direction exactly away from charge distribution, therefore is in exactly opposite direction in which increase in potential is steepest. Hence .

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Question (8)

QN0038904

From a point charge, there is a fixed point A. At A, there is an electric field of and potential difference of . Distance between point charge and will be

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

Correct Answer: A

Explanation:

.

We know that electric field

or

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Question (9)

QN0038905

Two metal pieces having a potential difference of are apart horizontally. A particle of mass is suspended in equilibrium between the plates. If is the elementary charge, then charge on the particle is

(A)
8
(B)
6
(C)
0.1
(D)
3

Correct Answer: D

Explanation:

In equilibrium,

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Question (10)

QN0038906

A point charge of magnitude is fixed at . An isolated uncharged spherical conductor, is fixed with its center at . The potential and the induced electric field at the centre of the sphere is :

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

Correct Answer: C

Explanation:

Potential .

Induced electric field

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Question (1)

A unit charge moves on an equipotential surface from a point to point , then

Explanation:

Link:

Question (2)

In moving from to along an electric field line, the work done by the electric field on an electron is . If and are equipotential surfaces, then the potential difference is

Explanation:

Link:

Question (3)

Which of the following figure shows the correct equipotential surfaces of a system of two positive charges?

Explanation:

Link:

Question (4)

Which of the following is NOT the property of equipotential surface?

Explanation:

Link:

Question (5)

Equipotential surfaces are shown in figure. Then the electric field strength will be

Explanation:

Link:

Question (6)

The potential at a point (measured in ) due to some charges situated on the -axis is given by volt. The electric field at is given by

Explanation:

Link:

Question (7)

The expression implies, that electric field is in that direction in which

Explanation:

Link:

Question (8)

From a point charge, there is a fixed point A. At A, there is an electric field of and potential difference of . Distance between point charge and will be

Explanation:

Link:

Question (9)

Two metal pieces having a potential difference of are apart horizontally. A particle of mass is suspended in equilibrium between the plates. If is the elementary charge, then charge on the particle is

Explanation:

Link:

Question (10)

A point charge of magnitude is fixed at . An isolated uncharged spherical conductor, is fixed with its center at . The potential and the induced electric field at the centre of the sphere is :

Explanation:

Link:

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Which of the following figure shows the correct equipotential surfaces of a system of
two positive charges?