A uniform sphere of mass M and radius R is surrounded by a concentric spherical shell of same mass but radius 2R. A point mass is kept at a distance `x ( gt R)` in the region bounded by spheres as shown in the figure . The net gravitational force on the particle is

Options

A. `(GMm)/(x^(2))`
B. `(Gmx)/(R^(3))`
C. `(G(M+m))/(x^(2))`
D. zero

Answer

A

Explanation

`F=mE=(mGM)/(x^(2))=(GMm)/(x^(2))`