Re: [Phys-l] Teaching Special Relativity by flogging and expired mare

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

-----------------------------------------snip----------------------
> On Mon, 6 Jul 2009, chuck britton wrote:
>
> > On Jul 6, 2009, at Jul 6(Mon) 1:43 , Jack Uretsky wrote:
> >
> > > 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
> >
> > Feynmann certainly leaves the impression that one can.

	As my correspondent (who once was Feynman's grader) asks:
What does he say to leave that impression?  He gives the explicit 
transformation equations, so simple algebra should demonstrate the 
impossibility of transforming pure electric into pure magnetic or vice 
versa.

Regards,
					Jack

--
"Trust me.  I have a lot of experience at this."
		General Custer's unremembered message to his men,
		just before leading them into the Little Big Horn Valley