CBSE Class 12-science Answered

an equipotential surface may be the surface of a material body or a surface drawn in an electric field.

The change in voltage is defined as the work done per unit charge against the electric field.

If a charge is moved along a path at right angles (i.e., perpendicular) to the field lines, there is no work done (W = 0) since there is no force component along the path. No work means no potential difference from point to point. Hence, the potential is constant along paths perpendicular to field lines. Such paths are called equipotentials

Hence no potential differnce, no work done.

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