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The angle between an equipotential surface and electric field lines is

1. 0°
2. 180°
3. 90°
4. 45°

Correct answer: 90°

Solution

An equipotential surface has the same potential everywhere, so moving along it requires no work. Electric field lines point in the direction of maximum decrease of potential and are perpendicular to equipotential surfaces. Hence the angle is 90°.

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