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If a planet is revolving around sun in c...

If a planet is revolving around sun in circular orbit with force F `propto` `r^(-5/2)`, where r is radius, then square of the period is proportional to

A

`r^-(7/2)`

B

`r^(3/2)`

C

`r^(5/2)`

D

`r^(7/2)`

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