sci.physics.electromag

"Bill Miller" wrote in message
news:aJVCj.24673$cQ1.6014@bgtnsc04-news.ops.worldnet.att.net...
> The title of the post pretty much says it all.
>
> The participants of this list seem to have fairly clear agreement that
> the primary *cause* of magnetic fields is the motion of charges.
>
> With a few hold-outs, most folks seem to (finally) understand that an
> E field does not *cause* an H field. (Those that disagree: p-l-e-a-s-e
> read Jefimenko's "Causality" before jumping in to dispute this
> statement.)
>
> OK. So far, so good.
>
> A permanent magnet has associated with it a magnetic field whose
> characteristics seem to be indistinguishable from those of a magnetic
> field that is caused by the motion of charges.
>
> Where the H--- does the H come from? How do we know?

Well, I think we pretty much know that it comes from atomic alignment of
their electron's orbital angular momentum. So there is "local" motion
of charges all coordinated. IOW, the atomic magnetic moments point in
the same direction and all add up. I don't think many physicists would
disagree with that.

Fred