Question

There is a shell of mass $M$ and density of the shell is uniform. The work done to take a point mass from point $A$ to $B$ is $[A B=r]$

• A. $\frac{GmM}{r}$
• B. $\frac{GmM}{R}$
• C. $- \frac{GmM}{r}$
• D. zero

Answer 1

Answer: (D)

zero

Answer 2

Gravitaional field inside the shell is zero, so no work required.