1. The problem statement, all variables and given/known data Radial component of an electric field near charge 'q'. E = (1 / 4∏ε) * (q/r^2) Need to find the potential of this which is done through integrating this and taking the negative answer, i.e. ΔV = -∫E dr This is to be along a radial path towards the charge, starting from infinity to r2. 3. The attempt at a solution So I have ΔV = - (q/4∏ε) ∫1/r^2 dr As the charge is constant. Just unsure on the limits, I'm guessing its ∞ and r2, would that be right?