1. The problem statement, all variables and given/known data A wire with linear charge density lambda is surrounded by a cylindrical conducting shell with radius r and surface charge density sigma. Find an expression for the electric field (magnitude and direction) as a function of distance d from the wire, on an axis perpendicular to the wire. 2. Relevant equations Gauss's Law 3. The attempt at a solution I know the electric field of a wire is lambda/(2*pi*r*permittivity of free space) however, I don't know how to find the electric field of a cylinder with a wire within it rather than just a single point charge.