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Re: EMF +- battery speculation



How about the PD produced by diffusion across a semiconductor NP junction?

Aside: An "EMF force" that might (at least macroscopically) be considered
"non electric" is the brute force mechanism of charge transport employed
in a van de Graff generator.

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor
----- Original Message -----
From: "John S. Denker" <jsd@MONMOUTH.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Sunday, March 24, 2002 1:28 PM
Subject: Re: EMF +- battery speculation


crawford j maccallum wrote:

I thought the "non-electric force" was a density gradient. No??

That's a totally new concept to me.

Density of what?
How is the gradient produced and sustained?
How does it produce a force on the charge-carriers?
What is the governing equation?
Can you cite a reference?