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Physics
A charger q is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:
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Q. A charger $ q $ is placed at the centre of circle of radius r. Then work done by charge Q in completing one round is:
Rajasthan PMT
Rajasthan PMT 1995
A
$ \frac{Q}{4\pi {{\varepsilon }_{0}}r} $
B
$ \frac{Qq}{4\pi {{\varepsilon }_{0}}r} $
C
zero
D
$ \frac{2q}{2r} $
Solution:
To move on a circular path, work done is zero because displacement is zero.