Re: Experiment - Displacement Current's Magnetic Fields

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Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Paul,

At 08:49 PM 3/10/2002 +0000, you wrote:
>Hi Terry,
>
>> ...I am looking for are terribly obvious flaws
>
>Look up the generalised Ampere's circuital law, aka the Maxwell-Ampere
>law.  That's the one that JCM invented by hypothesising the dD/dt term
>as a source for H.  The one you're trying to test.  An hours thought
>will save a weeks work.

And so it has ;-)

The experiment would fail its own sanity checks.  If I short the capacitor
in the center, it would still give zero reading indicating a SERIOUS
problem.  A sharp jump to 100% current would be observed as the capacitor
is rotated but just as the feed wires passed outside the sense coil's
dimensions rather than at the 90 degree point in a smooth transition.

>
>Now read up on why he did that.  Would Ampere's law make any sense
>without the dD/dt term?  No, because it would give two different
>values for the voltage induced in your coil.  One value if you
>integrate Curl H over a surface which cuts a feedwire to your cap,
>another value if you integrate over a surface which goes through the
>cap's gap.  Thus Ampere's law would not be self consistent. 
>

I guess one could look at the "invention" of dD/dT as a great theoretical
leap, or a kludge to make the darn thing work ;-))  I note that many
authors struggle with this.

>Yet Ampere's law works (it is an empirical law), and the search coil
>will give a reading consistent with both Curl H = J  *and*
>Curl H = dD/dt.  Whatever voltage appears on your search coil, you
>will not be able to tell whether it came from the J due to the wires
>leading to the cap, or from the dD/dt in the gap.  The two sources
>will give exactly the same value.

Yep!  Zero volts in any case...

>
>Your experiment will fail, and the dD/dt was added to Ampere's law in
>order to explain this failure.
>
>To test dD/dt, you must look for a property of the field which
>vanishes altogether if Curl H = J + dD/dt were not a correct
>description of nature.

That's not going to be easy is it ;-))  I will still pursue the Rogowski
Coil part since that is of great use.  However, my proposed experiment does
appear to be fatally "hosed".

The helical spark thing was my other "long shoot", but the effects there
are still do to conduction currents.  So I have run out of ideas for
testing the magnetic effects of displacement currents.  Scott is sending me
some papers of the "big guy's" attempts at this.  But they will need a
pretty good set of tricks to prove it either way.  

Thank's Paul :-)

Cheers,

	Terry

>--
>Paul Nicholson
>--
>