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Re: Is toroid a Faraday cage?
Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>
Tesla list wrote:
> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
> Tesla list wrote:
> > Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > A pretty question. Has anyone measured increased
> > belt drag in a van de Graaf?
> > (I'm not saying it doesn't happen, just not sure...)
> There is surely a drag, as the belt moves charges against the electric
> field, increasing the energy stored at the terminal. This energy comes
> from the mechanical energy spent to move the charges against the field.
> Antonio Carlos M. de Queiroz
I have a small VDG driven by a small 12 volt motor. The change in
motor speed during a charging/discharging cycle is very noticeable.
After a spark discharges the HV terminal the motor speeds up, and then
slows down due to the increased torque as the terminal is charged to
higher and higher voltages, "pulling the charge uphill". At least,
that's my explanation.