Which one of the following graphs represen

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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 $a$

A

B

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D

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 $a$

Intensity will be zero inside the spherical shell.
$I = 0$ upto $r = a$ and $I \propto \frac{1}{{{r^2}}}$ when $r > a$