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Electromagnetism is the branch of physics that deals with the relationship between electricity and magnetism. In 1820 Orsted's accidental discovery that magnetic fields are produced by electric currents. This incident catalized efforts to prove that magnetic fields can induce currents. Faraday showed in 1831 that a changing magnetic field can induce a current in a circuit, and J. C. Maxwell predicted that a changing electric field has an associated magnetic field. These three by unifying Electricity and Magnetism led to Physics into the path of unifaction that has now culminated in an effort to unify Relativity and Quantum Mechanics. The technological revolution attributed to the development of electric power and modern communications can be traced to these three discoveries.
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