Capacity of an isolated sphere is increased $n$ times when it is enclosed by an earthed concentric sphere. The ratio of their radii is
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
$\frac{{{n^2}}}{{n - 1}}$
- B
$\frac{n}{{n - 1}}$
- C
$\frac{2n}{{n + 1}}$
- D
$\frac{{2n + 1}}{{n + 1}}$
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