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electromagnetic buzzer
Chapter 2
Review of Related Literature

Electromagnetic is one branch of physics. It was concerned with magnetism produced by electric currents and with the interaction of electric and magnetic fields. Electromagnetism is defined the interaction between a magnetic field and an electric field. People use electromagnetic to transmit electricity to other place, to supply electricity form magnetic fields and to store and conserve energy. Electromagnet has components of strong interaction, weak interaction and gravitational. According to Hans Christian Ørsted that electricity and magnetism are linked. He proved that an electric current produces a magnetic field as it flows through a wire. His findings resulted in intensive research throughout the scientific community in electrodynamics. A French Physicist, François Arago, observed in 1820 that an electric current will orient unmagnified iron filings in a circle around the wire. Hans Christian Ørsted also influenced French physicist André-Marie Ampère's (1820) developments of a single mathematical form to represent the magnetic forces between current-carrying conductors. Ørsted's discovery also represented a major step toward a unified concept of energy. According to the observation of Michael Faraday, extended by James Clerk Maxwell, and partially reformulated by Oliver Heaviside and Heinrich Hertz, electromagnetic had far-reaching consequences, one of which was the understanding of the nature of light. Unlike what was proposed in Electromagnetism, light and other electromagnetic waves are at the present seen as taking the form of quantized, self-propagating oscillatory electromagnetic field disturbances which have been called photons. In 1802 Gian Domenico Romagnosi, an Italian legal scholar deflected a magnetic needle by electrostatic charges. Actually, no galvanic current existed in the setup and hence no electromagnetism was present. In another paper published Albert Einstein undermined the very foundations

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