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

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zero

Force between them $\times 2 π r$

Force between them $\times r$

Force between them $/ 2 π r$

answer is D.

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Detailed Solution

Given data:

Charges= $q_{1} & q_{2}$

Radius=r

Sphere has in circular path

Detailed solution:

The force between the two charges is along the radius of the circle that the charge is moved.

So, work done=0

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