Charges $+q$ and $-q$ are placed at points $A$ and $B$ respectively which are at distance $2\,L$ apart, $C$ is the midpoint between $A$ and $B$ . The work done in moving a charge $+ Q$ along the semicircle $CRD$ is 

 

  • A

    $ - \frac{{qQ}}{{6\pi \,{ \in _0}L}}$

  • B

    $\frac{{qQ}}{{4\pi \,{ \in _0}L}}$

  • C

    $\frac{{qQ}}{{2\pi \,{ \in _0}L}}$

  • D

    $\frac{{qQ}}{{6\pi \,{ \in _0}L}}$

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