Question

An equipotential surface is a surface with constant value of potential at all points on the surface.
What is the amount of work done in moving a $2\mu c$ charge between two points at $3cm$ apart on an equipotential surface?

Answer 1

The work done in moving a charge between any two points on an equipotential surface is zero , because

$W=q\Delta V=q\times 0=0$ (for equipotential surface $\Delta V=0$)