Question with Solution

A particle of mass m is placed inside a spherical shell, away from its centre. The mass ell is M The particle will move towards the centre The particle will move away from the centre, towards the nearest wall The particle will move towards the centre if $\mathrm{m}<\mathrm{M}$ and away from the centre if $\mathrm{m}>\mathrm{M}\left({\mathrm{D}}^{\ast }\right)$ The particle will remain stationary