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

The correct option is D Field at point 'a' due to Q and induced charges on inner surface of conductor is zero.
Due to electrostatic shielding, the electric field at point a due to induced charges on the inner surface of the conductor will be zero.

Similar case is applicable for point c due to induced charges on the outer surface.

Option (c) and (d) are correct.

Net field at point b will be zero (since it is inside the conductor), but field due to induced charges alone will not be zero.

Also, field at point a will not be zero since there are induced charges on the outer surface of the conductor.

i.e option (a) and (b) are wrong.

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