A coaxial cable as used in TV antennas has an inner conductor which is 0.5 mm in diameter and an outer conductor 5 mm in diameter. The outer conductor is a very thin shell.
(a) Calculate the inductance per unit length of the cable.
(b) What are the internal and external inductances per unit length?
(c) What is the inductance if you assume the inner conductor to be a very thin shell with outer diameter 0.5 mm instead of a solid conductor?