Q.

Charge q2 of mass m revolves around a stationary charge (q1) in a circular orbit of radius r. The orbital periodic time of q2 would be

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a

4π2mr2kq1q21/2

b

kq1q24π2mr31/2

c

4π2mr3kq1q21/2

d

4π2mr4kq1q21/2

answer is A.

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Detailed Solution

14πε0q1q2r2=mrω2=4π2mrT2          ω=2πT

  T2=4πε0r24π2mrq1q2

 Time period, T=4π2mr3kq1q21/2

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