A point charge 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

Question

A point charge 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 (A) zero (B) positive (C) negative (D) zero if the charge Q is at the centre and nonzero otherwise

Tardigrade Admin · Accepted Answer

Work done in displacement of charge, W=qΔ V where Δ V = potential difference between the displacement of charge Hence, work done in complete rotation is zero.

Q. A point charge $q$ 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

zero

positive

negative

zero if the charge $Q$ is at the centre and nonzero otherwise

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

Q. A point charge 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