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Q.

A thick metallic spherical shell of inner radius r1 and outer radius r2 has a charge +Q. A charge +q is placed at the centre of the shell. The charge per unit area on the outer surface is

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a

(Q−q)4πr22

b

(Q+q)4πr22+r12

c

(Q−q)4πr22−r12

d

(Q+q)4πr22

answer is C.

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Detailed Solution

Charge per unit area on outer surface =Q+q4πr22

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