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The capacity of an isolated sphere is in...

The capacity of an isolated sphere is increased n times when it is enclosed by an earthed concentric sphere. The ratio of their radii is

A

`n^2 / (n-1)`

B

`'n/(n-1)`

C

`2n/(n+1)`

D

`(2n+1)/(n+1)`

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The correct Answer is:
B
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