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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 same mass and radius R. The gravitational potential at a point situated at `(R )/(2)` distance from the centre will be

A

`- (4GM)/a`

B

`- (3 GM)/a`

C

`- (2GM)/a`

D

`- (GM)/a`

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The correct Answer is:
B
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