Inductance (fwd) [correction]

From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, April 07, 1998 3:34 PM
To:  Tesla List
Subject:  Re: Inductance (fwd) [correction]

Antonio, all,

> From:  Antonio C. M. de Queiroz [SMTP:acmq-at-compuland-dot-com.br]
> Sent:  Monday, April 06, 1998 1:36 PM
> To:  Tesla List
> Subject:  Re: Inductance (fwd) [correction]
> Malcolm Watts  wrote:
> > When discussing single layer solenoids in the context of Tesla Coils,
> > it should always be borne in mind that we are dealing with a
> > *particular* case of connecting these inductors. They are connected
> > to and worked against ground. For example, while Medhurst's Cself
> > formula works brilliantly in this context, it would utterly fail for
> > a coil in outer space unless that coil had a ground plane connected
> > to it and sited below it.
> I don't think so. A small highly conductive grounded plane close to the 
> coil or large plane less conductive far from the coil result in the same
> effect. At the limit, an infinitely large nonconducting plane at infinity
> produces also the same effect. A coil will resonate in much the same way
> when placed above ground of far in outer space. 
> Antonio Carlos M. de Queiroz
> http://www.coe.ufrj.br/~acmq

Well, the coil has to be connected to a significant current sink at 
least. Certainly, it is easily shown that self resonance occurs at an 
entirely different and much higher frequency if the coil is not 
connected to something like this. We know Medhurst refuses to work 
for half wave coils.