1. The problem statement, all variables and given/known data A parallel-plate capacitor is charged to an electric potential of 100 V by moving 4x10^19 electrons from one plate to the other. How much work was done? 2. Relevant equations How much work was done? 3. The attempt at a solution Work is then simply equals to -q*deltaV. Q= number of electrons times charge per electron. W= +4E19 * 1.6E-19 * 100= 640 J But the answer I was given was 320 J. I don't see a divisible of 2 anywhere that I can account for. Please help. Thanks.