Re: [Phys-l] Teaching Special Relativity

[Jack Uretsky <jlu@hep.anl.gov>]

Strictly speaking, there is no magnetic-electric equivalence.  A field 
that is purely magnetic in some reference frame can never be transforme ( 
by a L-transformation into one that is purely electric, and vice-versa.
					Regards,
						Jack
in




On Mon, 6 Jul 2009, Brian Whatcott wrote:

> This mass energy equivalency idea is so clearly evoked here that one
> immediately recalls the magnetic and electric field equivalency as
> viewed through the prism of relative velocity.
>
> Brian W
>
> Moses Fayngold wrote:
> > ________________________________
> > "carmelo@pacific.net.sg" <carmelo@pacific.net.sg> (Alphonsus) wrote onSunday, July 5, 2009 10:03:43 AM:
> >
> > ">>You may want to include Frank Wilczek's insight (See Below). That is,
> > mass of protonÿÿs mass comes from the relavististic masses of the
> > quarks and gluons. :-)
> >
> >                       Frank Wilczek's Happy 100th Birthday, Special Relativity"
> >
> >
> >   Yes, and one can also find this discussion in Wilczek's pieces "Mass without mass I, II"
> > in Physics Today(Nov. 1999 and Jan 2000)
> > In the closing remarks of the second one he writes:
> >
> >   "Most of the mass of ordinary matter, for sure, is the pure energy of moving quarks and gluons."
> >
> > (Phys. Today, Jan 2000, p. 14)
> >
> > Moses Fayngold,
> > NJIT
>
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