Question

Two concentric shells have masses $M$ and $m$ and their radii are $R$ and $r$, respectively, where $R>r$. If $x$ is the distance from the common centre, then what is the gravitational potential at a point for which $r<x<R$?

• A. $-G[\frac{M}{x}+\frac{m}{r}]$
• B. $-G[\frac{M}{x}-\frac{m}{r}]$
• C. $-G[\frac{M}{R}+\frac{m}{x}]$
• D. $-G[\frac{M}{R}-\frac{m}{x}]$

Answer 1

The correct option is C $-G[\frac{M}{R}+\frac{m}{x}]$