PhysicsEasy159×since 2002Q7257A 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 :AGM3a2{{GM} \over {3{a^2}}}3a2GMB2GM9a2{{2GM} \over {9{a^2}}}9a22GMCGM9a2{{GM} \over {9{a^2}}}9a2GMD2GM3a2{{2GM} \over {3{a^2}}}3a22GMCheck answerSkip