1. The problem statement, all variables and given/known data Use Poisson's equation and Laplace's equation to determine the scalar potential inside and outside a sphere of constant charge density po. Use Coulomb's law to give the limit at very large r, and an argument from symmetry to give the value of E at r=0. 2. Relevant equations del2V = - p/epsilono del2V = 0 3. The attempt at a solution Not sure how to start this just using Poisson's/Laplace's equation.