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P i sa point on an equipotential surface...

`P` i sa point on an equipotential surface `S`. The field at `P` is `E`.

A

`E` must be perpendicular to `S` in all cases .

B

`E` will be perpendicular to `S` only if `S` is a plane surface.

C

`E` canot have a component along a tangent to `S`.

D

`E` may have a nonzero component along a tangent to `S` if `S` is a curved surface.

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The correct Answer is:
A, C
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