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Two small and heavy spheres, each of mas...

Two small and heavy spheres, each of mass M, are placed a distance r apart on a horizontal surface. The graviational potential at the mid-point on the line joining the centre of the spheres is :-

A

Zero

B

`- (GM)/r`

C

`- (2 GM)/r`

D

`- (4GM)/r`

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The correct Answer is:
D
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