Re: angular momentum of electron

From: Jack Tremarco (jacktremarco_at_yahoo.com)
Date: 09/27/04 

Date: Mon, 27 Sep 2004 08:31:50 +0000 (UTC)

Your description is in classical terms. However, the origin of the
magntic dipole moment you mention is the spin which is a quantum
effect. You are therefore mixing classical and quantum physics, which
is likely the origin of your confusion.

In Dirac theory the spin and hence the magnetic moment emerge
naturally up to quantum corrections. Dirac theory ultimately makes
sense only if it is second-quantized. It's predictive power as a
classical equation of motion seems rather accidental. So you really
need a quantum theory to get it right. In a purely classical theory
the origin of the spin would necessarily remain a mystery.

All the best, Jack

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