Q87 / 120 · VITEEE 2019 · Physics

A point charge $\mathrm{q}$ is rotated along a circle in the electric field generated by another point charge Q. The work done by the electric field on the rotating charge in one complete revolution is

Correct answer
A
zero
B
positive
C
negative
D
zero if the charge $Q$ is at the centre and nonzero otherwise.

Solution

Work done in displacement of charge, $\mathrm{W}=\mathrm{q} \Delta \mathrm{V}$ where $\Delta \mathrm{V}=$ potential difference between the displacement of charge Hence, work done in complete rotation is zero.

Hence, the correct answer is option: 'A'.

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