A solid sphere of mass and radius is surrounded by a uniform concentric spherical…

PHYSICS · Single correct · ISC · Physics · Gravitation · Gravitation

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: (1)

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

(2)

\frac{GM}{3a^2}

(3)

\frac{GM}{9a^2}

(4)

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