A co-axial cable is simply a conducting cylindrical shell which surrounds a line conductor. Suppose the outer shell has a charge line density (?) of 5.00 nC/m and a radius of 4.20 mm, while the line charge has a density of -2.00 nC/m. suppose both the shell and line are infinitely long.

1) Compute the electric field halfway between the line charge and the outer shell (i.e. at 2.10 mm). (E = 1.71x10⁴ N/C, inward)

2) Compute the electric field 10.00 mm from the line charge. (5400 N/C, outward)