Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 74

Calculations. concerning the electromagnetic effect of currents in a good conductor usually neglect the displacement current even at microwave frequencies.
a) Assuming r , = 1 and = 5.70 x 10 7 (S/m) for copper, compare the magnitude of the d1splacement current density with that of the conduction current density at 100 (GHz).
b) Write the governing differential equation for magnetic field intensity H in a source-free good conductor.