Electromagnetic theory covers the basic principles of electromagnetism experimental basis electrostatics magnetic fields of steady currents motional emf and electromagnetic induction maxwells equations propagation and radiation of electromagnetic waves electric and magnetic properties of matter and conservation laws. The electromagnetic theory is a united theory of electromagnetism established by james clerk maxwell this theory primarily discusses the relationships between electric field and magnetic field based from previous observations and experiments related to electricity magnetism and optics combined. The history of electromagnetic theory begins with ancient measures to understand atmospheric electricity in particular lightning people then had little understanding of electricity and were unable to explain the phenomena. The electromagnetic wave disturbs the electric field at any point through which it passes it therefore moves the charges in the metal loop causing a current significant currents can create a large enough voltage at the gap to cause a spark indicating the presence of the electromagnetic wave
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