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Question (1)

QN0038914

A cube of a metal is given a positive charge Q. For this system, which of the following statements is true?

(A)
Electric potential at the surface of the cube is zero
(B)
Electric potential within the cube is zero
(C)
Electric field is normal to the surface of the cube
(D)
Electric field varies within the cube

Correct Answer: D

Explanation:

Surface of metallic cube is an equipotential surface. Therefore, electric field is normal to the surface of the cube.

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Question (2)

QN0038915

Figure below shows a hollow conducting body placed in an electric field. Which of the quantities are zero inside the body?

(A)
Electric field and potential
(B)
Electric field and charge density
(C)
Electric potential and charge density
(D)
Electric field, potential and charge density.

Correct Answer: B

Explanation:

Electric field is always zero inside a conductor.

If there is any excess of charge on a hollow conductor it always resides on the outer surface of conductor. Therefore inside a hollow conductor there is no charge and hence charge density is zero.

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