The capacitance \( (\mathrm{C}) \) for an isolated conducting sphere of radius (a) is given by \...

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The capacitance \( (\mathrm{C}) \) for an isolated conducting sphere of radius (a) is given by \( 4 \pi \varepsilon_{0} \mathrm{a} \). If the sphere is enclosed with an earthed concentric sphere. The ratio of the radii of the spheres being \( \frac{n}{(n-1)} \) then the
\( P \) capacitance of such a sphere will be increased by a factor

W
(A) \( n \)
(B) \( \frac{\mathrm{n}}{(\mathrm{n}-1)} \)
(C) \( \frac{(\mathrm{n}-1)}{\mathrm{n}} \)
(D) a .n
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