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Electric Field & Potential – 1 – 1

1. An electric dipole is placed in a uniform electric field. The net electric force on the dipole :

(a) is always zero
(b) depends on the orientation of the dipole
(c) can never be zero
(d) depends on the strength of the dipole

ANSWER

EXPLANATION

2. When the separation between two charges is increased, the electric potential energy of the charges :

(a) increases
(b) decreases
(c) remains the same
(d) may increase or decrease

ANSWER

EXPLANATION

3. A proton and an electron are placed in a uniform electric field.

(a) The electric forces acting on them will be equal.
(b) The magnitudes of the forces will be equal.
(c) Their accelerations will be equal.
(d) The magnitudes of their accelerations will be equal.

ANSWER

EXPLANATION

4. If a positive charge is shifted from a low-potential region to a high-potential region, the electric potential energy :

(a) increases
(b) decreases
(c) remains the same
(d) may increase or decrease

ANSWER

EXPLANATION

5. A point charge q is rotated along a circle in the electric field generated by another point charge Q. The work done by the electric field on the rotating charge in one complete revolution is :

(a) zero
(b) positive
(c) negative
(d) zero if the charge Q is at the centre and nonzero otherwise 

ANSWER

EXPLANATION

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