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
Diffcult
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(c) $C \propto \frac{{ab}}{{b - a}};$ $a = R -x, b = R$
$C \propto \frac{{R(R - x)}}{x}$
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