Two spheres each of mass M and radius R are separated by a distance of r. The gravitational potential at the midpoint of the line joining the centres of the sphere is
−4GMr
−GMr
−2GMr
−GM2r
A
−GMr
B
−2GMr
C
−GM2r
D
−4GMr
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Solution
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V=V1+V2
=+2V1
=2(−GMr/2)=−4GMr
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