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*To*: tesla@xxxxxxxxxx*Subject*: Re: Jacobsladder-Oscillator*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Thu, 29 Mar 2007 22:05:45 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <tcmlmod@xxxxxxxxxxxxx>*Resent-date*: Thu, 29 Mar 2007 21:05:43 -0700 (MST)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <ZR3MKyUG0vK.A.lWH.XyIDGB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: "Kurt Schraner" <k.schraner@xxxxxxxxxxx> Tesla list wrote:

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx> At 05:24 PM 3/28/2007, you wrote:Original poster: "Kurt Schraner" <k.schraner@xxxxxxxxxxx>

<snip>

Hi Jim, I generally concur with your review of the situation, as long as the Jacobsladder is used in its usual way, with the climbing arcs. BTW: In our case, we have tried to determine the induction-coil short circuit current, by measuring it with a moving iron armature ammeter, and have found a value of 0.4A(rms). Well, may be not very precise, but should give an order of magnitude (measured at the same conditions, as our experiment). I've not yet calculated the repelling magnetic force (with spark), which should be compared to the attracting electric force (without spark, at ~50-60kV). (JL heigth is 2m; average distance of rods ~5cm; rod diameter 0.8cm).1 amp, 1 meter spacing, 1 meter long, = 1 Newton Your wires are 5 cm apart. Average length is 1 meter (when spark is half way up), and you have 0.4A, so 0.4/0.05 or about 8 N.. that's a fair amount of force...

1 amp, 1 meter spacing, 1 meter long, = 2*1e-7 Newton (which is connected with the definition of the Ampère) And the formula for magnetic force between 2 (long-)parallel wires: F = (mue0/2pi)*(length/distance)*current^2 with mue0 = 4pi*1e-7 [H/m]; length=2m; distance=0.05m; current=0.4A leads to a repelling force of 1.28e-6 Newton for the case of my JL.

I can't imagine the electrostatic force being that high. I seem to recall that the electrostatic force between the top of my 400kV Van de Graaff with a 40cm spheroid to a similar sphereoid 20cm away was about 1 Newton... That's a lot more area and a lot more voltage.

An experiment, proposed by Gerry Reynolds, which also is demonstrating the electric/elecrostatic-force influence, was posted yesterday.

Better, I had given the archive link before: http://www.pupman.com/listarchives/2007/Mar/msg00635.html ...or, at least the link to the (3.6M)movie: http://twfpowerelectronics.com/~kurt/InductionCoils/P1000678.MOV Thanks, and best regards, Kurt

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