1. The problem statement, all variables and given/known data The figure below shows a portion of an infinitely long, concentric cable in cross section. The inner conductor has a linear charge density of λ = 6.10 nC/m and the outer conductor has no net charge. http://www.webassign.net/tipler/23-36alt.gif (a) Find the electric field for all values of R, where R is the perpendicular distance from the common axis of the cylindrical system. (Use R as necessary.) 1.50 cm R 4.50 cm R 6.50 cm (b) What are the surface charge densities on the inside and the outside surfaces of the outer conductor? 2. Relevant equations ∫EdA = Qinside/ɛo 3. The attempt at a solution Using the above equation I would get E(2pi*r^2*h) = Qenclosed/ɛo, but it is infinite in length and therefore no height is given. Any help appreciated.