Physics

Problem

A solid sphere of mass 'M' and radius 'a' is surrounded by a uniform concentric spherical shell of thickness

2a

and mass

2M

. The gravitational field at distance '

3a

' from the centre will be: a.

\frac{2GM}{9a^2}

\frac{GM}{9a^2}

\frac{GM}{3a^2}

\frac{2GM}{3a^2}