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Larmor precession
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A precession of the motion of charged particles in a magnetic field. It was first deduced in 1897 by Sir Joseph Larmor (1857–1942). Applied to the orbital motion of an electron around the nucleus of an atom in a magnetic field of flux density B, the frequency of precession is given by eB/4πmvμ, where e and m are the electronic charge and mass respectively, μ is the permeability, and v is the velocity of the electron. This is known as the Larmor frequency.
