Thischapterdiscussesthequestionoftimedependencyinsomedetail.Wewillseethattheelectricandmagneticfieldsunder 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 thereforeonD).Theabovepostulateswillbemodifiedtoaccountforthisdependency.Sincenowwemusttreatboththeelectric