The work done in moving a charge between two points on the same equipotential surface is
- A. maximum
- B. zero
- C. negative
- D. equal to qV
Explanation
Work equals charge multiplied by the potential difference, and on an equipotential surface that difference is zero, so no work is done however long the path. It follows that field lines always meet equipotential surfaces at right angles, since any component along the surface would do work. The surface of any conductor in equilibrium is an equipotential.
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