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Two conducting concentric, hollow sphere...

Two conducting concentric, hollow spheres A and B have radii a and b respectively, with A inside B. Their common potentials is V. A is now given some charge such that its potential becomes zero. The potential of B will now be

A

0

B

`V(1-a//b)`

C

`Va//b`

D

`V(b-a)//(b+a)`

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The correct Answer is:
B
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