A) \[\frac{R}{n}\]
B) \[R\,\left( \frac{n-1}{n} \right)\]
C) \[\frac{R}{{{n}^{2}}}\]
D) \[R\,\left( \frac{n}{n+1} \right)\]
Correct Answer: B
Solution :
\[{g}'=g\left( 1-\frac{d}{R} \right)\,\Rightarrow \,\frac{g}{n}=g\left( 1-\frac{d}{R} \right)\]\[\Rightarrow \,\,d=\left( \frac{n-1}{n} \right)\ R\]
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