1. The problem statement, all variables and given/known data What is the relationship between the magnitude of a radial electric field and and its associated potential? Choose the correct general relationship? 2. Relevant equations The following alternatives are given: a) E(r)= dV(r)/dr b) E(r)= V(r)/r c) E(r)= -dV(r)/dr d) E(r)= -V(r)/r 3. The attempt at a solution I know the electric field is proportional to the inverse of (r^2) and the potential is proportional to the inverse of (r). My problem lies in understanding the calculus of the above formulas. Can anyone guide me through them please?