Electric PotentialHardQuestion 31477
Question
Equipotential surface through a point in free space must be:
- AAlways a sphere
- BPerpendicular to E at every point on itCorrect
- CParallel to the nearest conductor
- DAlways flat
Correct answer
Perpendicular to E at every point on it
Explanation
By definition: E = −∇V. On an equipotential surface, V = const → ∇V along surface = 0 → E is perpendicular to the surface at every point.