Keith, After I potted the unit, as I recall, I lost the effect on all materials. As metals go, I had tried little niblets, BBs and rods of copper, aluminum, and bismuth. Now I DID NOT try a long rod suspended horizontally through the holes of a horizontal facing toroid pair, howevah. I agree that leakage flux could be a major artifact. It makes sense. I tried to get a pair of internally polarized NdFeB ring magnets made once. (It was an attempt to produce a permanent magnet version of said "A-Field" or vector potential toroids) Turned out wicked good, but there were still irregular outbreaks of maybe 300 to 500 gauss from the ring surface here and there, due to uneven-ness of the magnetizer windings. So yeah, with hand wound toroids there is potential for leakage. I would guess that if one could up the permeability of the torus material, leakage would diminish - but do they make such a ferrite? Fast yet furious; with low hysteresis, yet the permeability of "moo" metal? Moo.
nr --- Keith Nagel <[EMAIL PROTECTED]> wrote: > Hey Nick. > > I'm still of the opinion that leakage flux is > the causative agent here, at least for the > conductive > material being moved by the coils. I can see > your explaination would make sense for the lesser > magnitude effect seen with the non-conductors, > although I would expect some effect due to the > electric fields generated by the time changing > flux. When you say the effect dissapeared when > you potted the coils, do you mean all effects > or just the dielectric effect? > > Thanks for the experiment report, BTW. > > K. > > -----Original Message----- > From: Nick Reiter [mailto:[EMAIL PROTECTED] > Sent: Monday, December 20, 2004 11:47 AM > To: [EMAIL PROTECTED] > Subject: Re: magnetic vector potential > > > Gentlemen, > > I think it ws back in about 2000 or so that I came > across the website of the ATG group that had > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
