No collapsing magnetic field? (was Winding primary)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Randy & Lori" <rburney6-at-comcast-dot-net> 

Antonio,

I let this ride because I wanted to see what others had to say about
your statement that there is no collapsing magnetic field.  Nobody said
anything, which really leaves me curious.  I have been taught, and have
taught others, that any wire with current produces a magnetic field; and
in the case of AC, the field must collapse and rebuild in the opposite
direction for current to be allowed to reverse.  That collapsing
magnetic field will induce a voltage/current in the same direction as
the originally applied.  I have lit neon bulbs and drawn arcs with a
1.5V battery and an inductor demonstrating this.  Can you explain what
you mean when you say "there is no collapsing magnetic field"?

Randy

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, March 12, 2004 6:40 PM
To: tesla-at-pupman-dot-com
Subject: Re: Winding primary

Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
  >
  > Original poster: "Luke" <Bluu-at-cox-dot-net>
  >
  > With the low coupling all of the energy does not transfer from the
pri
  > to the sec.  Does the amount that does not transfer just feed back
into
  > the cap as the magnetic field collapses?  So the low coupling doesn't
  > equate to losses?  Instead of losses it just transfers the energy
  > slower?

Forget this thing of "magnetic field collapses". This does not happen.
A Tesla transformer transfers energy through a double resonance. With
any reasonable degree of coupling, and correct tuning, the energy that
is not transferred is lost in the primary circuit losses, before
the time when it would be transferred. If the coils are out of tune,
some energy remains circulating in the primary until it is dissipated
in the losses there, while only part of the energy is transferred to
the secondary, and back from it, periodically.
Take a look at my program Teslasim:
http://www.coe.ufrj.br/~acmq/programs (the site was down minutes ago...)
You can look at all the waveforms during the energy transfer with it.
The program Optesla can also plot the waveforms.

Antonio Carlos M. de Queiroz