An infinitely long solid conducting cylindrical shell of radius a = 3.8 cm and negligible thickness is positioned with its symmetry axis along the z-axis as shown. The shell is charged, having a linear charge density λinner = -0.55 μC/m. Concentric with the shell is another cylindrical conducting shell of inner radius b = 13.1 cm, and outer radius c = 17.1 cm. This conducting shell has a linear charge density λ outer = 0.55μC/m.