On the basis of your understanding of the following paragraph and the related studied concepts.
An equipotential surface is a surface with a constant value of electric potential at all points on the surface. The component of electric field parallel to an equipotential surface is zero, as the potential does not change in this direction. Thus, the electric field is perpendicular to the equipotential surface at each point of the surface. Further, say the direction of electric field electrical potential gradually fall with distance.
If a charge of 2 nC is taken from equipotential surface number 2 to 3, what is the amount of work done ?

Explanation

Work done `W = q(V_3-V_2) = (2 xx 10^(-9)C) xx (30-20) V = 2xx 10^(-8)J`