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A charge +Q is lying at the center of ...

A charge `+Q` is lying at the center of a circle. What is work done in carrying charge q from A to B, where A and B, both lie on the circle.

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The circular path around the charge `+Q` is an eqipotential surface. As A and B lie on the circle i.e, on the equipotential surface, work done = 0.
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