Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electric flux of an electromagnetic field.

As Saltzberg says, scientists have been tantalized by the prospect of magnetic monopoles since James Clerk Maxwell first formulated his famous four equations describing electromagnetism.

The energy of electric field stored in the capacitor placed in an alternating electromagnatic field is concluded by using the principle of superposition and by starting with Maxwell equations.