A particle of mass \( M \) is situated at the centre of a spherical shell of same mass and radiu...

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A particle of mass \( M \) is situated at the centre of a spherical shell of same mass and radius \( a \). The magnitude of the gravitational potential at a point situated at \( a / 2 \) distance from the centre, will be
[CBSE PMT 2010; CBSE PMT (Mains) 2011]
(a) \( \frac{4 G M}{a} \)
(b) \( \frac{G M}{a} \)
(c) \( \frac{2 G M}{a} \)
(d) \( \frac{3 G M}{a} \)
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