The work done in carrying a charge Q1 once round a circle of radius R with a charge Q2 at the centre is

Q: The work done in carrying a charge Q1 once round a circle of radius R with a charge Q2 at the centre is
(a)(Q1 Q2)/(4 π ε0R2
(b) zero
(c) (Q1 Q2)/(4π ε0 R
(d) infinite
Sol: (b)
Work done on equipotential line/surface is zero.

Author: Rajesh Jha

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