Re: Simple electricity, and yet.....!

On Thu, 16 Nov 2006, xray4abc wrote:

jimp@xxxxxxxxxxxxxxxxxxxx wrote:
xray4abc <lemhenyil@xxxxxxxx> wrote:

<snip>

That's true.
Yet, still we did not answered the question.
If there is no electric field line(s) along the conductor or a
Lorentz force exerted INSIDE the conductor,
then how come that the electrons are drifting along the conductor ?
In order to sharpen the question, I have considered the case of
a zero resistance conductor.
In my opinion, it needs a little bit more than a traditional answer!
LL

From a circuit analyses viewpoint, the answer is trivial.

What you are really asking is why and how does current flow in a conductor.

Yes. I have always thought that the electric field created by
the power source was "pushing" the electrons.
It seems that there is something wrong with this picture of the
process.

What makes aircraft fly at a constant velocity? Thrust = drag. What makes a spaceship travel at constant velocity? Thrust = drag must still be true, but drag = 0, therefore, one can conclude what?

You're specifically considering the case of R=0. Why should any force be needed to keep the electrons moving?

From a circuit analysis viewpoint, it really is trivial. From a Maxwell
viewpoint, it's less trivial. If you want it to be an educational problem, figure out how Maxwell gives you the circuit theory picture. Just keep in mind that circuit theory general treats wires as R=0, while in Maxwell, their conductivity is not infinite.

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html

.

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