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Two small spheres each carrying charge (...

Two small spheres each carrying charge (+q) coulomb are kept r meter apart and are found to repel each other with a force of F newton. One of the sphere is moved around the other in a circular path of radius, r. The work done in Joules is

A

`overset (rarr)F.overset (rarr) r`

B

`2pirF`

C

`pir^2F`

D

zero

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