Propeller Head Plaza

I disagree with that

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This Post Has Been Edited by the Author

In Reply to: RE: A few points posted by geoffkait on February 07, 2022 at 05:43:20

"The electrons moving back and forth in the speaker voice coil on the + and minus wires produce an alternating magnetic field that interacts with the speaker permanent magnet"

That isn't completely right either.

There is a direct force on the moving electron in a combined EM field:

F = q(E + v x B)

making a force perpendicular to the net current flow and the external magnetic field.

In a physical wire with a conduction band (which has low resistance for some electrons) the electrons are then pushed to one boundary of the wire.

At this point the electrons are somewhat bunched but the nuclei and bound electrons, net positively charged, is separated from the electrons by a slight amount and is then attracted to the electrons, moving the physical bulk of the wire (whose mass is dominated in the stationary nuclei in the crystal).

The magnetic field produced by the motion of the conduction electrons itself is a secondary effect, my guess that contributes to impedance at higher frequencies.

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