ABSTRACT
The new field is the time-varying electromagnetic field, which is caused by time-varying charges and currents. As opposed to static fields, the electric and magnetic fields constituting the time-varying electromagnetic field are coupled to each other and cannot be analyzed separately. Inductance can be interpreted as a measure of transformer electromagnetic induction in a system of conducting contours with time-varying currents in a linear magnetic medium. Briefly, self-inductance is a measure of the magnetic flux and induced emf in a single isolated contour due to its own current. In an electric circuit with all time-harmonic excitations of the same frequency, all responses in the steady state are also time- harmonic quantities with the same frequency or are zero. In the representation and analysis of a time-harmonic electromagnetic system or electric circuit using phasors, it is possible to have some phasors rotate in the clockwise and the other ones in the counter-clockwise directions.
