ESTABLISHMENT OF MAGNETIC FIELDS IN COILS J.Edwards

Magnetic fields are set up around current carrying conductors or coils in accordance with Ampere’s Law. These magnetic fields are initially established by displacement currents, in the propagating electromagnetic waves that radiate from the source when the current changes. Changes in conductor current are accompanied by radiating EH fields that establish a new level of magnetic field in the surrounding space, and this field is then maintained by the steady conductor current. This paper considers how the magnetic fields are set up around conductors, air cored coils and coils with magnetic cores, via electromagnetic waves when the current changes