1. The problem statement, all variables and given/known data Two parallel plates are separated by 10.0cm and a potential difference of 500.0V is maintained between them. What is the force on an electron between the plates? 2. Relevant equations 3. The attempt at a solution E = F / q = kQ / r2 V = kQ / r = Er = Fr / q F = Vq / r = 500.0 * e / 0.100 = 8 * 10-16 The actual answer is 8 * 10-18 Where did my calculation go wrong?