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Why are physicists the electronics experts?
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Rick Law:

--- Quote from: Berni on August 24, 2020, 05:33:10 am ---You are not going to see relativistic effects within the same blob of circuitry, no matter how fast it goes, that's sort of the point behind it that you can't detect your own absolute speed, only relative speed to something else.

GPS is one of the rare cases where you can see it happen because the fast moving satellite and slow moving receiver are communicating over a radio link. So even if they are not one physically connected circuit they are exchanging information. But even then all of this is only easily noticeable because the satellites have incredibly precise clocks in order to make such tiny timing differences show up (rather than getting lost under the clocks own natural drift)

If you wanted to see relativity within the same circuit then i suppose the best bet is to build a ring laser gyroscope using coax cable instead of fiber optics. Send a high frequency sine wave in a clockwise and a counterclockwise spool of coax and compare the timing while rotating the whole thing. Since its going along with the rotation and counter to the rotation you get a phase shift as if one of the cables got longer during rotation. Tho the effect is again really really tiny so they prefer using fiberoptics for actual gyros (fiber is tiny and light has a short wavelength).

--- End quote ---

Thank you!  That was the whole point I was making...  You wont see it within the same circuit. Anything/anyone traveling with the circuit wont see it.  And I pointed out the issues when sending signals off to someone not moving with the circuit.

That whole paragraph beginning with "Standard theory today is: if you are traveling with an electrical system..." seem to have been ignored.  Instead, the focus of the discussion was on the side comment paragraph that we really hasn't made things that go that fast.

I knew I could have worded it better in that initial reply, but at least you got what I was saying.  I'm pleased with that.
TimFox:
A reasonable description of the (relativistic) Sagnac effect in the fiber-optic gyroscope:
https://link.springer.com/chapter/10.1007/978-3-540-39490-7_3
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