Gauss' Law Practice Use Gauss' law to find the electric field when the charge density is: (a) p(x) = po exp {-K√x2). Expresses the answer in Cartesian coordinates. (b) p(x, y) = Po exp-K- p{. √x² + y² 1. Express the answer in cylindrical coordinates. (c) p(x, y, z) = po exp-k√√x² + y² + z² Express the answer in spherical coordinates.