The electric field :

A). always perpendicular to an equipotential surface.

B). is always tangent to an equipotential surface.

C). always bisects an equipotential surface.

D). makes an angle to an equipotential surface that depends on the amount of charge.

Always perpendicular to an equipotential surface

Explanation:

The space surround by a charge is called electric field. The surface where the electric potential is constant is called equipotential surface. The work done in moving a charge in electric field is given by :

Electric force is, F = qE

In equipotential surface, work done by the charge is 0.

So,

Hence, the correct option is (a) "always perpendicular to an equipotential surface".

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