A point \( P \) is lying at a distance \( r(a) \) from the centre of \( P \) shell of radius \( ...

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A point \( P \) is lying at a distance \( r(a) \) from the centre of
\( P \) shell of radius \( a \). If \( g \) and \( V \) be the gravitational field and potential

W at the point \( P \) then :
(A) \( g=0 \)
(B) \( g=-\frac{G M}{r^{2}} \)
(C) \( V=0 \)
(D) \( V=-\frac{G M}{a} \)
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