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Re: Tesla Coil RF Transmitter



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 11:53 AM 9/19/2005, Tesla list wrote:
Original poster: Steve Conner <steve@xxxxxxxxxxxx>

> This
> particular
> equation cannot meet the experiment, let alone
> confirm a magnetic
> field being produced by a varying electric field in
> a dielectric.

You're using a circular argument here. You started by
assuming that a magnetic field can't be produced by a
varying electric field in a dielectric, and you end up
asserting just what you assumed.

I'll restate my argument, which I don't think you have
done anything to disprove:

Power/energy can't be transmitted by either E or H
fields alone. It requires both to be present at once.

Therefore, if you see work of any kind being done on
an object in an electrical experiment, both E and H
fields must be present.

More to the point... you can't measure something without extracting some energy from it. (this is a basic information theory thing.. )

If power isn't being transmitted, then you can't measure it.



Therefore, moving charges around by mechanical means
in electrostatics experiments must generate H fields.
Granted, maybe a huge E and a tiny H, but the product
of E and H must still account for the power
transmitted.

I guess the corollary of that is that there must be an
E-field in the airgap of an ordinary induction motor
too, such that I can integrate the Poynting vector
over a control surface drawn around the rotor and get
an answer that accounts for the motor's mechanical
output. That is a little harder to believe :-/ But
since the H field is so strong, it would only take a
very small E field to make the math add up.

Back when I was in high school some 30 years ago, I set up an experiment to do just this. It failed miserably, not due to the phenomenon not existing, but due to the "very small" effects you've mentioned. The changing magnetic field produces small E field, but also induces a voltage in every conductor near by, and that dominates the whole thing. I also attempted to measure the magnetic field produced by a rapidly changing E field.


Now, I'm older and wiser, and technology has advanced somewhat. I can think of experimental methods that would help: optical fibers, for instance, and the Kerr effect. Have to be careful with experimental design still.