Hello PF, I am having a bit of difficulty understanding this question. 1. The problem statement, all variables and given/known data "A thin wire with linear charge density λ is surrounded by a conducting cylindrical shell." (There is a hollow cylinder with a wire though it) "If the electric field must be zero inside a conductor, is the electric field due to the wire shielded from extending beyond the conducting shell?Find the electric field as a function of distance r from the thin wire." 2. Relevant equations EA = Qenc/ε0 Q = P/V surface area (A) = 2πrl 3. The attempt at a solution I'm having more conceptual difficulty with this question than mathematical. There is a charged wire in a conductor, but the inside of the conductor must have an E field of zero (at equilibrium). How does this happen? How does the charge on the conductor rearrange or move to cancel the E field? Do I assume the charge can't leave the wire? To find the E(r) I would just use a Gaussian surface at different intervals (I know it's zero until r>R of cylinder). After that the Q enclosed is just constant from the surface of the cylinder shell. Thanks for the help.