1. The problem statement, all variables and given/known data My question is one of clarification about electric potential. 2. Relevant equations See Below 3. The attempt at a solution I understand that when electric potential is defined at infinity to be zero for a series of point charges, the potential is simply kq/r. My question is is it possible to define zero to be at the origin, and if so what would the new expression be. It would seem that the integral would yield a 1/0 term which would be undefined.