On Sun, 11 May 2008 11:02:58 -0500, Tom Roberts
wrote:

PCB wrote:
I read somewhere that only electric currents generate magnetic fields.

That is incorrect. The intrinsic spins of elementary particles also
produce magnetic fields.


[Hammond]
At present there is no scientific explanation of WHY the
electron has "spin" angular momentum and consequently a
magnetic dipole moment. It is only an experimentally
discovered fact which was then inserted ad hoc into QED by
Dirac in the 1920's where it remains today.
Interestingly, J.R. Yablon (on this newsgroup, s.p.r.)
has shown that circulation of the electron in the 5th Kaluza
Klein dimension can actually explain the "spin" of the
electron, in fact the spin and the magnetic moment of all
the charged leptons. K-K posits that a 4th spatial
dimension is curled up in a circle on the order of the
Planck Length and the electron moves at a constant velocity
q/m in that dimension, and it is precisely that circular
"current" that causes the magnetic dipole moment of the
electron and hence "permanent magnets" so called.
Yablon is a highly competent mathematical physicist and
his paper has been reviewed by Phys. Rev. I have read the
review (wch. was posted on s.p.r.) and apparently they
rejected the paper solely on the grounds that the idea was
too shocking and simple to possibly be true! Which as
anyone can see is a quite inadequate and unfair response!






Where is the electric current in a permanent magnet?

There is none.


[Hammond]
Na, unlikely.... it's more likely charge circulation in the
4th Klauza Klein dimension.

Is a permanent magnet a frozen electric current in matter?

No.

It seems that the electric current in a magnet would like to flow, but
it cant.

No. Iron is conductive, as are most other permanent magnets.


The bulk magnetization of a permanent magnet is due to the alignment of
spins in the constituent atoms. This cannot be understood classically,
QM is required.

[Hammond]
That is debatable since Klauza Klein is an entirely
classical theory, and handily explains the origin of
electron "spin" and the magnetic dipole moment f the
elementary particles.

Tom Roberts

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