A small planet is revolving around a very massive star in a circular orbit of radius r with a period of revolution t. If the gravitational force between the planet and the star were proportional to then t would be proportional to
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Gravitational force αR−52
Centripelal force αR−52
mRw2αR−52
w2αR−52−1
w2αR−72
(2πT)2αR−72
T2αR72
Hence b is the correct answer.
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