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Re: [Phys-L] big circuit

Sharhram wrote: >   Radio transmission cannot occur without an electric current. Besides why do
   we need a switch if radio transmission occurs spontaneously?
The first sentence due to Sharhram is true.The second sentence, due to Tycho is false.
Radio emission occurs anytime you turn a light switch on at home.It is low amplitude and evanescent. It does not require a DC circuit!Evanescent in this situation means << 10 milliseconds.That was the weakness of Veritanium's position: he supposed the radio transient ( his instant energy transmission) was good for lighting his lamp. On Sunday, December 5, 2021, 11:24:49 AM CST, Shahram Mostarshed via Phys-l <phys-l@mail.phys-l.org> wrote:

Radio transmission cannot occur without an electric current. Besides why do
we need a switch if radio transmission occurs spontaneously?

I believe the main point in the video is that we're dealing with
electrodynamics and not electrostatics.


On Sun, Dec 5, 2021 at 8:46 AM Brian Whatcott <betwys1@sbcglobal.net> wrote:





    - From: Shahram Mostarshed <smostarshed@gmail.com>
    - Date: Sat, 4 Dec 2021 19:27:34 -0800
  Hopefully this video will settle the argument that Veritasium was wrong
in
  implying that energy doesn't flow in wires:
https://youtu.be/-jJB8dyOJIw >
  S. Mostarshed
  Physics Instructor, Stanford OHS>
It may be that Veritasium is wrong in supposing the "radio" transmission
of energy lights up a lamp immediately, but it is demostrably true that a
modest fraction of the available energy is transfered to the lamp in
nanoseconds via transmission line effects.
In turn, Tycho may have an admirable "physics attitude" in particular when
he asserts he has  no specialist insight in the field during this video
expose, but some exposure to transmission  line theory  (which tends to be
thin in the US) would help him.
Brian
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