Applying AC voltage between two metal electrodes produces a changing electric field in space, and this electric
field in turn creates a displacement current, causing an electric current to flow between the electrodes. At
the same time, the displacement current produces a changing magnetic field around itself according to the second
of Maxwell's equations (Ampere-Maxwell Law). The resulting magnetic field creates an electric field around itself
according to the first of Maxwell's equations (Faraday's Law of Electromagnetic Induction).
Based on the fact that a changing electric field creates a magnetic field in this manner, electromagnetic waves-in
which an electric field and magnetic field alternately appear-are created in the space between the two electrodes
and travel into their surroundings. Antennas that emit electromagnetic waves are created by harnessing this principle.
