1. The problem statement, all variables and given/known data What is V(P) – V(R), the potential difference between points P and R? Point P is located at (x,y) = (50.0 cm, 50.0 cm). 2. Relevant equations V=-∫Edl flux=∫EdA=Q/ε 3. The attempt at a solution My attempt is in the attached photo to illustrate that I have worked the problem out and keep getting the wrong answer. I was able to obtain the electric field at point P but not V(P)-V(R). I assumed that you would allow rd to be x and dl to be dx. When it comes to plugging in the numbers something isn't lining up so I figured it is must be conceptual.