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

1. A. qQ 2 0L
2. B. qQ 6 0L
3. C. - qQ 6 0L
4. D. qQ 4 0L

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