Re: [Phys-l] two kinds of electrical charge ????????

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

	In one of my first E&M discussion labs I have the students do pith 
ball experiments designed to distinguish between the attractive force from 
electrical polarization and the attractive force between positive and 
negative charges.
	Two-fluids isn't all that bad if one  fluid is compiosed of 
electrons and the other of protons - the two fluids are mixed together in 
modern accelerator designs (electron coooling of proton beams, for 
exxample).
	I'll try to put my lab on my website in the next day or so, if it 
isn't already there.
				Regards,
					Jack




On Mon, 30 Jul 2007, John Denker wrote:

> Hi --
>
> Recently I was asked about the following statement:
>  «There are two kinds of charge, namely positive charge and negative charge.»
>
> That expresses the /two-fluid/ model of electrical charge.
>
> 1) Would anybody care to comment on this, perhaps contrasting it with the
> one-fluid model?
>
> This seems fundamental to any physics course ... yet there seems to be
> more divergence of opinion than I would have expected.
>
>
> 2) As you might have guessed, I have an opinion:
>  http://www.av8n.com/physics/one-kind-of-charge.htm
> Suggestions or comments on my analysis are welcome.
>
> I suspect there are arguments and counterarguments I have missed, although
> most discussions I've seen fall into the category of PbBA (Proof by Bold
> Assertion) which I don't find helpful.
>
>
> 3) I'd be interested to hear briefly:  What text are you using, and how
> does it handle this issue?
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
> https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l

--
"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