Physics - Gravitation Question with Solution | TestHub

The value of the acceleration due to gravity when the body moves below the surface of the earth at the depth, $d$ in terms of the radius of the earth, and acceleration due to gravity at the surface of the earth, then at depth:

$g_{\text{eff }}=g\left(1-\frac{d}{R}\right)\Rightarrow \frac{g}{n}=g\left(1-\frac{d}{R}\right)\Rightarrow d=\frac{(n-1)R}{n}$.