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Q.

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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a

zero

b

Force between them ×2πr

c

Force between them ×r

d

Force between them /2πr

answer is D.

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Detailed Solution

Given data:

Charges= q1 & q2

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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