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Re: TC Electrostatics (fwd)
Richard Hull wrote:
[ka-snip]
> Ed,
>
> Thoughtful post, I must cogitate on it a bit. I will note a nice
> experiment just performed over the Xmas holidays.
>
> I took my gaussmeter (FW BEll 700) and my Keithley electrometer and set
> up a 10 foot loop of wire (broken in the center) and connected it to a
> 150 watt 10kv DC supply. With a 1 megohm resistor in the middle of the
> loop. I noted only about .1 guass mag field (near the limit of
> discernment with the meter). The E-field near the wires was very weak
> too (~1^10-11 coulomb). Next I took a ten meg resistor and the mag field
> effectively went away. The E filed tripled around the wires. finally I
> installed a 300 megohm resistor and the e field was every where - 10^-5
> coulomb near the wire- (nearly an open). Needless to say the mag field
> was just at a vanishing point.
>
> It would appear that a macroscopic mag field capable of doing real
> pondermotive work and a macroscopic E field capable of doing pondermotive
> things are 100% mutually exclusive to conductive circuiry. They just are
> not friendly to one another and will only be mutually present in tiny
> amounts if equally potent. (whatever equally potent will mean to the
> pensive mind). It seems that current, the producer of mag fields and
> voltage the producer of E fields are not normally found in a wire
> together.
[snip]
> Richard Hull, TCBOR
Very interesting, indeed. Did you measure the actual voltage across the
resistor in each of the three cases?
-GL