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Re: Tesla Coil RF Transmitter
- To: tesla@xxxxxxxxxx
- Subject: Re: Tesla Coil RF Transmitter
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Sun, 18 Sep 2005 11:58:39 -0600
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- Resent-date: Sun, 18 Sep 2005 11:58:45 -0600 (MDT)
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Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
Slow reasioning. Current is the movement of electrons past a point in a
given time. A magnetic field is produced any time electrons move past a
given point in a given time or current flows. As the earth spins electrons
in the earth surface move past a given point in a given time (one day) and a
N-S magnetic field is produced. This fact is true in a sub microscopic world
of atoms and magnoscopic levels of the galixcy The fact of throwing a
battery out a window to produce a current is subject to real valid debate
because the charge is produced only when a chemical reaction taxes place.
Throwing a static charged object out the window is more valid as electrons
would be moving past a given point in a given time.
> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: Fri, 16 Sep 2005 12:31:50 -0600
> To: tesla@xxxxxxxxxx
> Subject: Re: Tesla Coil RF Transmitter
> Resent-From: tesla@xxxxxxxxxx
> Resent-Date: Fri, 16 Sep 2005 12:37:36 -0600 (MDT)
> Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>> "In this electrostatic event energy is
>> surely transferred
>> without the benefit of a magnetic field or current.
>> If you see it
>> otherwise, please produce the experiment."
> This is a Gedanken experiment :P I thought about it
> some more, and I guess that physically moving a
> charged body is similar to charging and discharging a
> fixed capacitor. After all when you move the body,
> even though the charge on the body stays constant, the
> E-field seen by surrounding objects will change since
> the geometry of the system has changed.
> So, I hope we agree the moving body creates a
> time-varying E-field. Then, if you believe Maxwell's
> equations- the relevant one being
> curl H= J+dD/dt
> the time-varying E-field (the dD/dt term) creates a
> displacement current and this current gives rise to a
> magnetic field. Then, any mechanical work done on
> surrounding objects by "electrostatic"
> attraction/repulsion must be accounted for by E x H.
> I bet that if you do all the math, the energy balance
> will add up. We have all seen the experiment where
> styrofoam packing peanuts or pie dishes get launched
> from the terminal of a HV DC power supply. If I drew a
> control surface around one of those peanuts in
> mid-flight, and calculated the integral of the
> Poynting vector over the surface, I would expect to
> find an inward EM power flow that equalled the
> mechanical power lifting and accelerating the peanut.
> That's how my argument goes. To be honest, I am
> starting from the biased viewpoint that Maxwell's
> equations are valid and power can't be transmitted by
> pure E or H fields- wherever you have power, there
> must be both E and H. So I invite you to put forward a
> counter argument.
>> Do you really think tossing a dipole battery with
>> positive and
>> negative poles and equal but opposite charges out a
>> window can create
>> a radio wave?
> As long as the positive and negative poles are
> separated by a non-zero distance (ie the battery has a
> finite size) it should work as the EM effects of the
> two ends won't exactly cancel. If it spins as it
> falls, so much the better :)