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

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

`(-qQ)/(6piepsilon_0L)`

`(qQ)/(2piepsilon_0L)`

`(qQ)/(6piepsilon_0L)`

`(-qQ)/(4piepsilon_0L)`

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