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Question

A solid conducting sphere of radius a is surrounded by a thin uncharged concentric conducting shell of radius 2a. A point charge q is placed at a distance 4a from common centre of conducting sphere and shell. The inner sphere is then grounded. The charge on solid sphere is


A
q2
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B
q4
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C
q8
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D
q16
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Solution

The correct option is B q4
The net charge on isolated outer sphere is zero.

Let, the charge on the inner sphere is qA.

Now, potential on the inner sphere due to charge q and qA will be,

Vm=qA4πϵ0a+q4πϵ0(4a)

The inner sphere is grounded, hence its potential is zero.So,

Vm=0

14πϵ0qAa+14πϵ0q4a=0

qAa=q4a

qA=q4

Hence, option (b) is correct answer.

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