How much work is done in moving a charge q between two points on a equipotential surface?

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 2µC charge between two points at 3 cm apart of an equipotential surface?

Give any two properties of equipotential surface?

5J of work is done in moving a positive charge of 0.5C between two points. What is the potential difference between the points?