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A particle of mass M is situated at the ...

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

A

`- GM/a`

B

`- 2GM/a`

C

`- 3GM/a`

D

`- 4GM/a`

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