Gravitational field intensity

Question

Which one of the following graphs represents correctly the variation of the gravitational field (F) with the distance (r) from the centre of a spherical shell of mass M and radius a

Easy

Solution

Intensity will be zero inside the spherical shell.

I = 0 upto r = a and $\mathrm{I}\propto \frac{1}{{\mathrm{r}}^{2}}\text{when}\mathrm{r}\mathrm{a}$

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