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

Question

${{qQ} \over {2\pi {\varepsilon _0}L}}$

${{qQ} \over {6\pi {\varepsilon _0}L}}$

$-$ ${{qQ} \over {6\pi {\varepsilon _0}L}}$

${{qQ} \over {4\pi {\varepsilon _0}L}}$

Solution

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