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Electrons are round!
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Simon:

--- Quote from: aetherist on August 14, 2023, 07:30:56 am ---
--- Quote from: Simon on August 14, 2023, 06:14:55 am ---
--- Quote from: aetherist on August 14, 2023, 04:08:13 am ---
--- Quote from: TimFox on August 14, 2023, 03:33:06 am ---
--- Quote from: aetherist on August 14, 2023, 12:40:38 am ---
--- Quote from: TimFox on August 13, 2023, 11:46:45 pm ---Once again, if electricity “hugs the surface” of a wire, then why does the DC conductance (reciprocal of resistance) scale with the cross-sectional area, not the circumference?

--- End quote ---
Interesting -- are there good measurements?
On the other hand -- why are lightning down conductors often flat strap?

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One of a myriad of sources for resistance of copper wire:  do the math.
https://commons.wikimedia.org/wiki/File:Copper_cable_resistance.jpg

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I did the math. That/there chart says that resistance decreases with radius R in a linear way.
The circumference of round wire increases in a linear R way with radius.
The area of a round wire increases in an RR way.
Hence area has nothing to do with resistance.
Circumference has everything to do with resistance.

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I'll break the forum rules now and tell you that you are a fucking idiot! I don't know what math you are smoking but you are wrong. This is so basic that it is hard to explain to an idiot that will not listen!

the area of a circle is r^2*pi
the circumference is r*2*pi

Now if you were not an idiot you would spot the obvious! but you are a fucking idiot!!!

You should, if you were not a fucking idiot be able to see that the circumference will increase linearly with the radius while the area increases with the square. Maybe you would like to go down your local electrical store and buy different gauges of wire, then spend more money than you need to to learn basic physics and buy a milliohm meter, or buy so much of that wire in large gauges that it actually registers some ohms on a meter.

Now measure them and tell us your results.

WARNING: DO NOT post in this thread again until you come back with correct results. Failure to do so will result in instant banning!

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Ok, i have the correct results. I got my results from the link provided by TimFox.
A 1.0 mm Cu wire 1000 m long has a resistance of 35 ohm
A 10.0 mm Cu wire 1000 m long has a resistance of 3.6 ohm.
A 10.0 mm wire has a Xsectional area 100 times that of a 1.0 mm wire.
Hence the resistance of a 10.0 mm wire should be 0.35 ohm based on Xsection area.
And the resistance of a 10.0 mm wire should be 3.5 ohm based on circumference.
So, my circumference theory has an "error" of 0.1 ohm.
But your area theory has an error of 3.15 ohm.

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good lord, heaven knows how I correctly worked out harness lengths in my previous career particularly when I had to calculate the length of cable required to supply a load that was more sensitive than most to voltage drop on a 24V system. I must have been on magic mushrooms at the time and was obviously helped by the fairies..... Or I used my understanding of current and correct physics.
vad:

--- Quote from: gnuarm on August 14, 2023, 04:07:09 pm ---
--- Quote from: TimFox on July 07, 2023, 06:42:25 pm ---Don't rely on the headline.
The actual research result involved an upper limit on the dipole moment of the electron.
"Roundness" is not a real technical term in particle physics.

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I'm confused.  How could the electron have a dipole moment?  It consists of no constituent parts.  It is a primitive particle.  To have a dipole moment, it would need two opposite charges, separated by a distance.  Is someone proposing the electron is not primitive?

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The currently accepted theory, known as the standard model, postulates that the electron is an elementary particle without any internal constituents. The experiment have confirmed this theory on a smaller scale than ever before.

Whether the standard model is accurate, and whether elementary particles lack a geometric shape at even smaller scales is unknown. Alternative theories might surface if future experiments reveal finer structures within elementary particles.

Physics differs from climate “science”. In physics, room for doubt exists, and there are always alternative theories. Experimental physicists always try to find anomalies that cannot be explained by theories.
T3sl4co1l:

--- Quote from: Simon on August 14, 2023, 06:14:55 am ---WARNING: DO NOT post in this thread again until you come back with correct results. Failure to do so will result in instant banning!

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So.... we're waiting :popcorn:

Tim
SiliconWizard:
Damn, I woke the beast! :-DD

Entertaining though.
BILLPOD:

--- Quote from: Stray Electron on July 07, 2023, 05:19:37 pm ---
--- Quote from: G7PSK on July 07, 2023, 03:46:58 pm ---New measurements on roundness of electrons.
https://www.sciencenews.org/article/electron-round-new-measurement-matter-physics

--- End quote ---

  And Pie R Squared.

Pie R Round, Cake R Square :-DD

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