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Two small but heavy spheres , each of ma...

Two small but heavy spheres , each of mass M are on a horizontal plane separated by a distance r. Find the gravitational potential at the mid-point of the line joining the centres of the two spheres.

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Gravitational potential at the mid-point of the line joining the two centres,
`V=(-GM)/(r//2)+(-GM)/(r//2)=-(2GM)/r -(2GM)/r=-(4GM)/r`.
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