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Re: TC Secondary Currents - was ( Experimental Help - Terry?)



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

I was looking for the B field that should accompany a time varying E field..
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, March 06, 2002 6:52 PM
Subject: Re: TC Secondary Currents - was ( Experimental Help - Terry?)


> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
> Tesla list wrote:
> >
> > Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jimlux-at-earthlink-dot-net>
>
> > The real problem is that c^2 proportionality constant.  It takes a HUGE
> > change in electric field going very fast (in my case, a spark gap
discharged
> > the cap) to produce a very small magnetic field, which is tough to
detect in
> > the presence of all that changing E field.
>
> Proportionality constant? The magnetic field produced by the
> displacement
> current should be the same produced by an equal "real" current. If this
> is the case, you don't need more than a few mA to have something clearly
> observable (5 mA in a wire are enough for Oersted experiment, with a
> sensitive compass).
>
> The main problem is to separate the magnetic field caused by currents
> in the capacitor plates and wiring from the field caused by the
> displacement current.
>
> There are some sites in the web, from university laboratories, showing
> measurement setups for displacement current. The ones that I have seen
> don't appear to be much careful about this...
>
> I am thinking about the following: Make a capacitor from two large metal
> disks, and connect AC from a signal generator to it through a coaxial
> cable, at one side of the assembly. Try then to detect a magnetic field
> at the edge of the capacitor, exactly at the other side, using a probe
> coil, maybe behind a grounded metal plate for electrostatic shielding.
> With this setup any magnetic field caused by currents in the capacitor
> and wiring will be cancelled or be in the wrong direction. Any magnetic
> field oriented along the circunference of the disk must be due to
> "displacement current".
>
> A Wimshurst machine charging the capacitor would probably cause too
> much interference for a precise measurement. A spark discharge can
> easily induce hundreds of volts in everything around...
>
> Antonio Carlos M. de Queiroz
>
>
>
>