OK, having some trouble wrapping my head around this so would appreciate some clarification. Let us say I had a long, thin wall metal tube of radius R with a uniform charge per unit length. Would there be some magnitude of E of the electric field at a radial distance of R/2? I understand that there would be no net flux using a gaussian surface smaller than the radius of the tube. I also understand that at the center of the tube, E would be zero. However, I would think that at the radius of R/2 there would be some electric field there. Could someone explain to me as to why or why not there is E at R/2?