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A solid conducting sphere of radius 10 c...

A solid conducting sphere of radius `10 cm` is enclosed by a thin metallic shell of radius `20 cm`. A charge `q = 20 mu C` is given to the inner sphere is connected to the shell by a conducting wire.

A

12 J

B

9 J

C

24 J

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
B
`H=U_(i)-U_(f)=(q^(2))/(2C_(1))-(q^(2))/(2C_(2))`
`C_(1)=4 pi in_(0)R_(1),C_(2)=4 pi in_(0)R_(2)`.
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