The variation of gravitational force on a mass due to the solid sphere of mass M and radius R is depicted as

The gravitational force due to solid sphere is

$$\begin{gathered} from universal law of gravitation F=G\frac{Mm}{r^2} \\ case 1: for a point inside sphere, Force of attraction is, \\ F=\frac{GMm}{R^3}r\mathrm{......}forr<R here universal gravitation cons\tan t=G; mass=m ; sphere mass=M; dis\tan ce=r; radius of the sphere=R \\ here if r=0 then F=0 \\ if r⩽R then F \alpha r , hence graph is a straight line upto r=R \\ case 2: for a point outside sphere, Force of attraction is, \\ F=G\frac{Mm}{r^2}forr\ge R \\ for r⩾R, F \alpha \frac{1}{r^2} graph is a curve \end{gathered}$$