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
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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