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Charge +q and -q are placed at points A ...

Charge +q and -q are placed at points A and B respectively which are distance 2 L apart . C is the mid point of A and B . The work done in moving a charge +Q along the semicircle CRD as shown in the figure below is

A

`(-qQ)/(6pi epsilon_0 L)`

B

`(qQ)/(2pi epsilon_0 L)`

C

`(qQ)/(6pi epsilon_0 L)`

D

`(-qQ)/(4pi epsilon_0 L)`

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