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

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

  1. A

    4π2mr3kq1q21/2

  2. B

    kq1q24π2mr31/2

  3. C

    4π2mr4kq1q21/2

  4. D

    4π2mr2kq1q21/2

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    Solution:

    14πε0q1q2r2=mrω2=4π2mrT2          ω=2πT

      T2=4πε0r24π2mrq1q2

     Time period, T=4π2mr3kq1q21/2

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