Find the gravitational potential due to a spherical shell of mass `M` and radius `R` at `r lt R` and `r gt R`, where `r` is the distance from the centre of the shell.

Which one of the following plots represents the variation of the gravitational field on a particle with distance r due to a thin spherical shell of raduis R ? ( r is measured from the centre of the spherical shell).

Which one of the following plots represents the variation of the gravitational field on a particle with distance r due to a thin spherical shell of raduis R ? ( r is measured from the centre of the spherical shell).

Which one of the following plots represents the variation of the gravitational field on a particle with distance r due to a thin spherical shell of raduis R ? ( r is measured from the centre of the spherical shell).

A point charge Q is placed inside a conducting spherical shell of inner radius 3R and outer radius 5R at a distance R from the centre of the shell. The electric potential at the centre of the shell will be