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Re: Tesla Coil RF Transmitter

Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>

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.

You're confused. Please re-read what I said. I'll repeat it more clearly here and there is no circular arguement. No one can experimentally measure a magnetic field produced by a "dispalcement current" in a dielectric field. This despite the fact that displacement currents are measured in amperes.

You introduced "displacement current" when you argued Maxwell's equation:

curl H= J+dD/dt

This equation does not fit or apply to the experiment at hand of waving a macroscopic chaged body back and forth longitudinally. Maxwell's equation curl H= J+dD/dt requires an electrically closed loop circuit. An electrically closed loop does not exist in this experiment. (Even if an EM wave was launched off into space, it's still not a closed loop.)

Specifically, curl H= J+dD/dt does not apply to this experiment. The experiment does not meet all the requirements of the equation.

A non applicable equation cannot describe a magnetic field in the experiment.

I hope this is a little clearer and non circular. If you dislike Maxwell's equation requirements feel free to modify them and convince everyone else.

Stork





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.
It is possible to do work by electrostatic forces,
such as in Van de Graaff generators, electrostatic
motors, and sticking balloons to the ceiling by
rubbing them on a cat.
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.
Steve Conner
http://www.scopeboy.com/

.