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Question

If the gravitational field intensity at a point is given by g=GMr2.5Then the potential at distance r is
  1. 2GM3r1.5
  2. GMr3.5
  3. GM3r1.5
  4. g=GMr3.5

A
GM3r1.5
B
2GM3r1.5
C
g=GMr3.5
D
GMr3.5
Solution
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V=Edr

V=rinfinityGMr2.5dr

V=2GM3[1r1.5]rinfinity

V=2GM3r1.5

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