The work done ($W$) in moving a charge $q$ from point A to point B in an electric field is given by the expression $W = q(V_B - V_A)$, where $V_B$ and $V_A$ are the electric potentials at the final and initial positions, respectively [1]. This work done is independent of the path taken and the shape of the electric field lines or equipotential surfaces [2]. Since the potential difference $(V_B - V_A)$ is the same for all four diagrams (assuming standard potential values usually depicted in this problem, e.g., moving between the same potential values in different field configurations), the work done is identical in all cases.