Quote:
Originally Posted by clpetersen
A case of getting what you pay for. And why electrical engineering was invented (putting practical sense into the physics).
He is right in the beginning - a changing electric field creates a magnetic field and vice versa. But he then tries to apply that to a steady-state case - dc current flowing in a conductor. A transformer (or speaker coil or autoformer) works with alternating current - apply dc voltage and you get a simple short circuit ...
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It isn't clear what you mean here. An audio signal is an AC signal, so the electric field is always changing.
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