Electron Orbit Magnetic MomentFrom the classical expression for magnetic moment, μ = IA, an expression for the magnetic moment from an electron in a circular orbit around a nucleus can be deduced. It is proportional to the angular momentum of the electron. The effective current is

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Orbital Magnetic MomentThe magnetic moment associated with an electron orbit is given by Taking into account the quantization of angular momentum for such orbits, the magnitude of the magnetic moment can be written A unit of magnetic moment called the "Bohr magneton" is introduced here. The zcomponent of the magnetic moment is given by

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