1. The problem statement, all variables and given/known data A) Calculate the work performed by an external agent to move a charge of -0.59x10-12 C from `i' to `b'. B) Calculate the magnitude of the electric field at `k' 2. Relevant equations W = q∆V Where ∆V is the potential diﬀerence between the two potential lines each point lies on E = -∆V/∆L 3. The attempt at a solution A) I know the work equation is charge x the change in V but I am not sure how to interpret the Equipotential lines in order to get change in V. B) I know the equation is E = -∆V/∆L but I am not sure how to calculate both those variables from the graph. The real question I have is how to interpret this graph to get ∆V and ∆L? I know that an Equipotential contour graph shows the plain perpendicular to the e-filed thus making Volts zero at any place there isn't a point charge.