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(a) A conductor A with a cavity as sho...

(a) A conductor A with a cavity as shown in Fig, is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor.
(b) Another condutor B with charge q is inserted into the cavity keeping B insulated from A. Show that the total charge on the outside surface of A si `(Q+q)` fig.
(c) A sensitive instument is to be shielded from the strong electrostatic field in its enviroment. Suggest a possibe way.

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