A hollow spherical conductor X is given a charge 'q' .another conductor Y with charge 'Q' is placed inside X insulated from it. if Y is not at the centre of X then charge on the outer surface of X is 1) -Q 2) Q 3). q+Q 4) q-Q

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Q. (a) A conductor

A

with a cavity as shown in Fig. (a) is given a charge

Q

. Show that the entire charge must appear on the outer surface of the conductor.

(b) Another conductor

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

Q + q

(c) A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.

(a) A conductor A with a cavity as shown in Fig. 1.36(a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor. (b) Another conductor 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 is Q + q [Fig. 1.36(b)]. (c) A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.