Larmor precession refers to the precession of the magnetic moments of electrons or atomic nucleii in atoms around the direction of an external magnetic field. The magnetic field exerts a torque on the magnetic moment, producing a gyroscopic motion, much like the spinning of a top. The angular velocity of the precession is There are two types of precession, torque-free and torque-induced, the latter being discussed here in more detail. ... In physics, the magnetic moment of an object is a vector relating the aligning torque in a magnetic field experienced by the object to the field vector itself. ... Properties The electron is a fundamental subatomic particle which carries a negative electric charge. ... Properties An atom (Greek Î¬ÏÎ¿Î¼Î¿Î½ from Î¬: non and ÏÎ¿Î¼Î¿Î½: divisible) is a submicroscopic structure found in all ordinary matter. ... Current flowing through a wire produces a magnetic field (M) around the wire. ...
where γ is the gyromagnetic ratio and is the external magnetic field. The gyromagnetic ratio is different for each type of atomic nucleus.
The concept of Larmor precession is used in nuclear magenetic resonance.
Precession causes the cycle of seasons (tropical year) to be about 20.4 minutes less than the period for the earth to return to the same position with respect to the stars as one year previously (sidereal year).
Discrepancies between the observed perihelion precession rate of the planet Mercury and that predicted by classical mechanics were prominent among the forms of experimental evidence leading to the acceptance of Einstein's Theory of Relativity, which predicted the anomalies accurately.
The precession of the orbit of the Earth is an important part of the astronomical theory of ice ages.
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