Statement I: The gravitational potential due to a uniform sphere at an external point is same as tha

Question

Statement I: The gravitational potential due to a uniform sphere at an external point is same as that due to a single particle of equal mass placed at its centre.
Statement II: The potential due to a uniform spherical shell is zero throughout the cavity of the shell. 
(Assuming Gravitation potential at infinity is taken to be zero)

Professor PC Thomas Classes · Answer

The potential due to a uniform spherical shell is constant throughout the cavity of the shell and is equal to the value at the surface.