1. The problem statement, all variables and given/known data Figure 23-37a shows a narrow charged solid cylinder that is coaxial with a larger charged cylindrical shell. Both are noncon-ducting and thin and have uniform surface charge densities on their outer surfaces. Figure 23-37b gives the radial component E of the electric field versus radial distance r from the common axis, and Es = 3.0*103 N/C.What is the shell’s linear charge density? 2. Relevant equations Gauss' Law 2λ/4piεr = 2Kλ/r 3. The attempt at a solution Since I know the inside of the shell would be 0 I looked at the graph and determined that Eexternal = -2000N/C and r = .035m so then I do -2000N/C = 2kλ/r do some magic algebra λ = -4 * 10-9 C/m The solution manual shows something different and says that Eexternal = -3000N/C and that I should use Eexternal-Einternal to solve. The book gets λ′ = –5.8 × 10−9 C/m. This really confuses me on many levels.