Induction Currents from Circular Coils Model ID: 124 A time-
varying current induces a time-varying magnetic field. The
magnetic field induces currents in neighboring conductors. The
induced currents are called eddy currents. In this model, the
phenomenon is illustrated by a time-harmonic field simulation as
well as a transient analysis, where the eddy currents resulting
from the source being switched on are studied. Two current-
carrying coils are placed above a copper plate. They are
surrounded by air, and there is a small air gap between the
coils and the metal plate. The external source is applied as a
current density, but the total current density in the coils is
obtained only by taking the induced currents into account. The
time-harmonic case will show the skin effect, that is, that the
current density is high close to the surface and decreases
rapidly inside the conductor.