Hey all, So the question in Jackson 1.4 is that I have 3 spheres that all have a total charge Q on them, but each sphere has different material properties. For instance, I have a conducting sphere, a sphere with a uniform charge distribution, and one with a charge distribution that has a charge distribution that varies as rn. It's the last one I am having trouble with, how can I get an r dependence in ρ without screwing up the units? I tried something like: ρ(r) ∝ ρo*(rn+1/rn) buuuuut that still leaves me some messed up units. Also, ρ0 = 3Q/(4πr3) Any ideas?