This chapter discusses the question of time dependency in some detail.Wewill see that the electric and magnetic fields under
time-varying conditions are interdependent. A time-varying electric field generates a time-varying magnetic field and vice
versa. Thus, the time-dependent magnetic flux density B (and therefore H) is dependent on the electric field intensity E (and
therefore onD). The above postulateswill bemodified to account for this dependency. Since now we must treat both the electric