Re: Electron magnetic moment inside magnetic field

"The Ghost In The Machine" <ewill@xxxxxxxxxxxxxxxxxxxxxxxxxxx> a écrit dans
le message de news: 9uq9n2-gd.ln1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> In sci.physics, srp
> <srp@xxxxxxxxxxxx>
> wrote
> on Sat, 04 Jun 2005 13:55:43 GMT
> <zpioe.41673$9A2.8994@edtnps89>:
>> "logan" <logansummersh@xxxxxxxxx> a écrit dans le message de news:
>> 1117854709.790339.98820@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>
>>> Lets just use the example of electrons
>>> moving in a wire producing current and
>>> magnetic field perpendicular to it. I wonder how the tiny magnetic
>>> field produced by those all billions of electron spins of
>>> the current affect the larger magnetic field.
>>
>> They simply build up additively to become that larger magnetic field.
>>
>> Look up the Biot-Savart law
>
> Presumably, they also impart a force on the electrons, which is
> then transmitted to the wire -- a principle used to advantage
> in electric motors.

You seem to be talking about current induction in a wire by an externally
produced magnetic field.

I don't think this is what the OP meant. In his setup he was inquiring
about the magnetic field that appears as current flows in a wire, where
the magnetic field appears as a result of the current flow. In that
specific case, I can't see how that m-field could contribute to the
flow.

André Michaud


.

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