1. What is (integral over all space) delta^3(r-r0)r^2d^3r where d^3r=dxdydz=dV and r0=(0,1,2)? answer: I'm not quite sure what the intergral over all space means.How can r0 be integrated if it's just given as points? 2. Obtain Coulomb's law for the electric field of a point charge from Gauss's law, by considering a spherical surface S of radius r with a point charge +q at its center. answer: I don't know how to do this. Can someone help? Please!