1. The problem statement, all variables and given/known data Find the electric potential a distance of .5 x 10^-10 m from the proton of a hydrogen atom 2. Relevant equations V= kQ/r 3. The attempt at a solution I know how to answer the question, because I know which equation to use. What I do not understand is, where the equation comes from ? Could somebody bullet point the derivation of the equation (algebra, not calculus please ) Regards and Thanks!