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Question

If the gravitational force between two bodies is directly proportional to 1r(not 1R2), where ′R′ is the distance between the bodies. Then the orbital speed for this force in circular orbit is proportional to

A
1R2
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B
Ro
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C
R
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D
1R
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Solution

The correct option is B Ro
According to question, gravitational force FG=GMmR
Now Fcentrfugal=FG

mv2R=GMmRv=GM

Thus vRo

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