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Two small spheres each carrying a charge...

Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to

A

Force between them `xx r`

B

Force between them `xx 2pi r`

C

Force between them `//2pi r`

D

zero

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The correct Answer is:
D
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