ABSTRACT
The behavior of the electromagnetic field in any medium is governed by Maxwell’s equations . The macroscopic Maxwell’s equations in SI units are given by
∇ ⋅ =D( , ) ( , )r t r tρ (2 .1)
∇ ⋅ =B( , )r t 0 (2 .2)
∇ × = −E B( , ) ( , )r t r t
t δ
δ (2 .3)
∇ × = ∂ ∂ +H
D J( , )
( , ) ( , )r t
r t t
r t
(2 .4)
where D denotes the electric displacement, B the magnetic induction, E the electric field, and H the magnetic field . The sources of the field are the free charge density, ρ, and the free current density, J .
