On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$. The work done will be

  • [AIIMS 1997]
  • A

    $q \times 2\pi r$

  • B

    $\frac{{q \times 2\pi Q}}{r}$

  • C

    Zero

  • D

    $\frac{Q}{{2{\varepsilon _0}r}}$

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