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Electron Magnetic Moment's Difference From Classical Mechanics

  1. May 17, 2012 #1
    I was reading the Wikipedia article on Electron magnetic dipole moments and it mentioned that the "g-factor" is need in determining the magnetic moment of an electron because it varies by approximately two from the prediction of classical mechanics. Why exactly does this discrepancy occur?
  2. jcsd
  3. May 17, 2012 #2


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    Because the classical orbital motion is a totally different thing compared to the quantum mechanical angular momentum which has 2 distinctive parts: orbital (which has a classical counterpart) and spin (which doesn't have a classical counterpart).

    It's the same difference as computing the deflection angle on star radiation due to solar gravitational field in Newtonian mechanics and gravity versus Einstein's GR.
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