Assuming potential energy '$U$' at ground level to be zero.

All objects are made up of same material:-

$U_P=$Potential energy of solid sphere

$U_Q=$Potential energy of solid cube

$U_R=$Potential energy of solid cone

$U_S=$Potential energy of solid cylinder

Two concentric shells of masses ${\mathrm{M}}_1$ and ${\mathrm{M}}_2$ are having radii ${\mathrm{r}}_1$ and ${\mathrm{r}}_2$. Which of the following given below is the right expression for the gravitational field at a distance r is

There is a concentric hole of radius $\mathrm{R}$ in a solid sphere of radius $2\mathrm{R}$. Mass of the remaining portion is $\mathrm{M}$. What is the gravitational potential at centre?