Читать книгу Introduction To Modern Planar Transmission Lines - Anand K. Verma - Страница 142

The electrical charge and the electric current are the primary electrical sources for the creation of the electric field and the magnetic field, respectively. The charge, also current (displacement current), is described by the flux field, i.e. the flux density (). Two electrically charged bodies or two current‐carrying conductors interact through the force fields, i.e. the field intensity (). The static charge creates the static electric field around itself, whereas the electric current creates the magnetic field around itself. The magnetic charge does not exist in nature. Sometimes, we talk about the magnetic charge, only as a mathematical source for the magnetic field. It is a hypothetical creation to maintain the symmetry of the field equations. The charge and current, i.e. flux fields are not determined by a medium, whereas the electric and magnetic interactions, i.e. force fields, between two separate bodies in a medium, are influenced by the electromagnetic parameters of the medium.