Practicing Success
A shell of mass M and radius R has a point mass m placed at a distance r from its centre. The gravitational potential energy U(r) vs r will be. |
$U(r)=\left\{\begin{array}{l}-\frac{G M m}{r}, r \geq R \\ -\frac{4 G m}{R}, r<R\end{array}\right.$ |