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Principle of Superposition

A conductor h...

Question

A conductor has a random shaped cavity in it. There is a point charge placed inside cavity. One more point charge is placed outside as shown. The conductor is earthed. Obtain the potential due to outer surface charges of the conductor at point A.

A

KQ/d

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B

Kq/l

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C

zero

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D

can't be obtained with given information

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Solution

The correct option is C zero
The potential due to the outer surface charges of the conductor at point $A = 0$ potential of inside the of equipotential surface will be zero.

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