A particle of mass M is situated at the centre of spherical

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A particle of mass M is situated at the centre of spherical shell of mass M and radius a. The magnitude of the gravitational potential at a point situated at a/2 distance from the centre, will be

V_P = V_{spherical shell} + V_particle

=	GM	=	GM	=	3GM
	a		a / 2		a

	2GM
	a

	4GM
	a