question_answer 50)

                  The gravitational force between a hollow spherical shell (of radius R and uniform density) and a point mass is F. Show the nature of F vs r graph where r is the distance of the point from the centre of the hollow spherical shell of uniform density.

Answer:

                    \[F=\frac{GMm}{{{r}^{2}}},\] where \[M=\,\frac{4}{3}\,\pi {{R}^{3}}\rho \]                 Variation of F with r is shown in figure