In a spherical condenser radius of the outer sphere is R. The different in the radii of outer and inner sphere in x. Its capacity is proportional to

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xR(R−x)

x(R−x)r

R(R−x)x

answer is C.

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Detailed Solution

C∝abb−a; a=R−x, b=R so, C∝R(R−x)x

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