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Charge q2 of mass m revolves around a st...

Charge `q_2` of mass m revolves around a stationary charge `q_1` in a circular orbit of radius r. The orbital periodic time of `q_2` would be ........

A

`[ (4pi^2 mr^3)/(kq_1 q_2)]^(1//2)`

B

`[ (kq_1q_2)/(4pi^2 mr^3)]^(1//2)`

C

`[ (4pi^2 mr^4)/(kq_1q_2)]^(1//2)`

D

`[ (4pi^2 mr^2)/(kq_1q_2)]^(1//2)`

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