1. The problem statement, all variables and given/known data I just did a question on a charge moving relative to a stationary charge from an initial position x1 to a final position x2. I was under the impression that for questions involving coulombs law, and the equations for Electric Field Strength, Force and Potential we ignore any -ve signs on charges? So after checking my answer I saw that I had the right magnitude but the wrong sign. The only thing I did differently was take the charge in my equation for the potential as 4μC instead of -4μC as can be seen on line 4 of the calculation below. 2. Relevant equations 3. The attempt at a solution Any insight into this will be greatly appreciated!