Question

The amount of work done in moving a unit positive charge through a distance of $10\mathrm{cm}$ on an equipotential surface is

Answer 1

Potential difference:

1. Potential difference is defined as the work done to displace a unit charge between two points
2. It is the difference between the electric force between two points.
3. It is the energy needed to move a charged body from one point to another.
4. An equipotential surface means that the potential difference between any two points on the surface is zero.
5. Thus no amount of energy is needed to move the charge to any point on the surface, no matter how far.
6. Thus, the amount of work done is also nil

Therefore, the amount of work done in moving a positive charge through a distance of $10\mathrm{cm}$ is $0\mathrm{J}$.