Question

What is not true of equipotential surface?

• A. The PD between any two points on the surface is zero
• B. The electric field is always perpendicular to the surface
• C. Equipotential surfaces are always spherical
• D. No work is done in moving a charge along the surface

Answer 1

The correct option is C Equipotential surfaces are always spherical

Equipotential surface

$\to$ P.D difference between two points on the surface is zero always since potential is same everywhere in equipotential surface.

$\to$ The EF is always perpendicular to the surface because there is no potential gradient along any direction parallel to the surface P so no EF parallel to the surface

$\to$ Equipotential surface can have any shape not just sphere.

$\to$ No work is done in moving a charge along the surface, because potential difference is zero.

Hence option (C) is correct