I dont really understand Gauss' law - any help with this question would be appreciated? Coaxial cables are made of a copper wire in the center and a concentric cylindrical shell of copper outside, with insulating material in between and outside the shell. The charge per unit length of the cable are given as λ1 (positive) in the inner wire and −λ2 (negative) in the outer shell. Sketch qualitatively the electric field lines on a plane perpendicular to the cable assuming it is very long. Consider three cases: (a) λ1 > λ2, (b) λ1 = λ2 and (c) λ1 < λ2. Explain your diagrams using the concepts of flux and Gauss' law.