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Imagine a light planet revolving around ...

Imagine a light planet revolving around a massive star in a circular orbit of raidus r with a a period of revolution T. If the gravitational force of attraction between planet and the star is proportioanl to `r^(-5)//^(2)`, then find the relation between T and r.

A

`R^(3//2)`

B

`R^(3//5)`

C

`R^(7//2)`

D

`R^(1//4)`

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The correct Answer is:
D
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