What is the work done in moving a charge of 10 micro Coulomb between two points on an equipotential surface?

What are equipotential surfaces?

What is equipotential surface?

How much work is done in moving a 500 muC charge between two points on an equipotential surface?

How much work is done in moving a charge of 5C between two points in a circuit having a potential difference of 10 V?

A 500 mu C charge is at the centre of a square of side 10 cm. find the work done in moving the charge of 10 mu C between two diagonally opposite points on the square.