Re: Velocity of Electrons

AJW wrote:
> Consider this. If in fact you could render the average electron
> velocity zero by causing Hg flow, doesn't it follow that with no
> imposed voltage, making the Hg flow would cause a magnetic field?

Not quite, because then the electrons and ions would be moving together
(same direction, same speed etc.), and would be canceling out each
other's magnetic effects. The funny thing is that from what I've heard
about this dynamo effect (see previous post) it seems that actually
forcing a flow on Hg might cause a somewhat weak magnetic field. I
haven't got the slightest idea what the mechanisms behind that would
be.

> And why would Hg be different than say a copper wire on some form of
> spindle, rolling from one spool to another with an imposed voltage
> between the spools?

Essentially Cu+ ions are stuck into place, so that they don't budge
quite as much as Hg+ ions do in each collision, but apart from that I
don't think there's much difference.

> It gets better. If the moving wire can alter the electron flow, that
> means moving the wire can increase its electrical resistance. After
> all, resistance has the units of volts per ampere, the voltage remains
> the same, amperes decrease (under the assumption that motion changes
> the current flow).

Um yeah, but as we've said before, moving the ions the opposite way
actually contributes to the current, so my guess is that the current
stays the same (or at least isn't affected as smoothly as we imagine
it). Also, I think there's a definition of resistance that doesn't
quite depend on V=IR, it has to do with how much energy is lost in
these bouncings we've talked about.

Regards,

Aydin

.

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