Question

Figure shows a conductor with cavity inside it. Charge Q is kept inside cavity. a, b and c are 3 points as shown in figure. Choose the correct option(s).

• A. Field at point 'a' due to induced charges is zero.
• B. Field at point 'b' due to induced charges is zero.
• C. Field at point 'c' due to induced charges on outer surface of conductor is zero.
• D. Field at point 'a' due to Q and induced charges on inner surface of conductor is zero.

Answer 1

Answer: (C), (D)

The correct options are
C Field at point 'c' due to induced charges on outer surface of conductor is zero.
D Field at point 'a' due to Q and induced charges on inner surface of conductor is zero.

Due to electrostatic sheilding, the electric field at point 'a' due to induced charges on inner surface of conductor and Q will be zero.
Similar case is applicable for point 'c' due to induced charges on outer surface.