Re: Is toroid a Faraday cage?

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

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: "Jolyon Vater Cox by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> 
> Apart from role as a capacitor, does the toroid of a TC work along the
> principle of a Faraday cage or Faraday s Ice Pail or -similar to the dome
on a
> Van der Graaf generator- in that the secondary is connected to the inner
> surface where there is no net charge -all charge being collected on the
> exterior?

This doesn't work if the charges are deposited inside the terminal by a
wire. In a VDG generator, charges are deposited inside the terminal by
an insulating belt. A grounded wire would discharge a charged terminal,
no matter where it is connected. There is no charge inside the terminal,
but the potential is the same of the outer side. The "ice pail" effect 
doesn't apply to a Tesla coil terminal. (At least not in this way. The 
terminal reduces the electric field around the wires at the top of the 
coil by essentially the same effect).
 
> Also if the inner wall of a Faraday cage has infinite electrical
"suction" ie.
> it can never become charged no matter how much electricity is supplied to it,
> is the only difficulty in getting charge into the cage due to the
repulsion of
> the electric field on the outside?

Yes. And due to air breakout at the outer side of the cage when the
charge density, and the electric field, becomes too high.

Antonio Carlos M. de Queiroz