1. The problem statement, all variables and given/known data A uniform electric field of 16.9 N/C is directed in the positive x direction. If a charge of -2 micro-coulombs moves 2.2 meters in the negative x direction, how much does the electric potential energy change in micro-joules? 2. Relevant equations ΔEPE = qEd 3. The attempt at a solution Since the charge is moving against the field the change in EPE should be positive, therefore I just plugged in the numbers and got 111.04. That answer was wrong, however, but I have no idea why. Any help would be appreciated.