1. The problem statement, all variables and given/known data Professor Milly Coulomb finds it takes 3.0 J of work to drag, at constant speed, a -9.0 mC charge between the plates of a parallel plate capacitor. (a) What is the work done by the electrical force in taking the charge between the plates? (b) What is the potential difference between the plates of the capacitor? 2. Relevant equations PE = (QV) / 2 V = 2PE / Q 3. The attempt at a solution b) V = 2PE / Q V = (2 * 3) / -.009 V = -666.667 V For part b, I tried both positive and negative values but they were both wrong. For part a, I tried the values of 0 and 3 but they were wrong also. Thanks for anyone who helps!