The depth \( d \) at which the value of acceleration due to gravity becomes \( 1 / n \) times th...

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The depth \( d \) at which the value of acceleration due to gravity becomes \( 1 / n \) times the value at the surface, is \( [R= \) radius of the earth]
[MP PMT 1999; Kerala PMT 2005;
Similar MP PET 2003]
(a) \( \frac{R}{n} \)
(b) \( R\left(\frac{n-1}{n}\right) \)
(c) \( \frac{R}{n^{2}} \)
(d) \( R\left(\frac{n}{n+1}\right) \)
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