[SOLVED] Equipotential surfaces 1. The problem statement, all variables and given/known data http://personalpages.tds.net/~locowise/test/equipot1.jpg Fig. 1 -- Some equipotential surfaces In the figure above, you see a set of equipotentials representing an electric field in the region and some labeled points (A..G). What is the work required by you to move a 3.4 x 10^-6 C charge from E to F? We know k=8.99*10^9 N*m^2/C^2 2. Relevant equations r = kq/v Work = force * displacement V2-V1=-Welec/q 3. The attempt at a solution Calculated Re to be 196.81m and Rf to be 305.66m. <---not sure if this is necessary Vf-Ve=-80V -80V=-Welec/(3.4*10^-6C) Welec comes out to be 2.72*10-4 J Could someone point out where I made a mistake or even if I used the correct method? Many thanks for your help!