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A base-level question about electromagetism, magnetic fields, & conductors

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cvanc:
"Magnetic fields arise from the motion of electrons in a conductor" is a rule known to us all.

But if you could magically convince the same number of electrons to travel the same path without a conductor you would get the same magnetic field, correct?

In other words the physical structure (conductor) can be thought of as an electron holder and it's the electrons alone doing the work.

ataradov:
Any structure that allows electrons to flow is a conductor. So, if you convince electrons to flow in some material, that material is a conductor, at least under the "convincing" conditions

TimFox:
The beam of electrons running in vacuum down the column of a particle accelerator (synchrotron, Van der Graaf, linac, etc.) induces an external magnetic field proportional to the current flow thereof.
There are several vendors who sell magnetic-field sensors (either simple toroidal-core coil or a DCCT) to measure the beam current as a diagnostic for the accelerator user.
A very long article from CERN about beam diagnostics in accelerators:  https://cds.cern.ch/record/499098/files/p154.pdf  See section 2.01

Alex Eisenhut:

--- Quote from: cvanc on September 29, 2023, 05:23:42 pm ---"Magnetic fields arise from the motion of electrons in a conductor" is a rule known to us all.

But if you could magically convince the same number of electrons to travel the same path without a conductor you would get the same magnetic field, correct?


--- End quote ---

Yes. That's called a CRT. Not magic.

SiliconWizard:

--- Quote from: ataradov on September 29, 2023, 05:37:23 pm ---Any structure that allows electrons to flow is a conductor. So, if you convince electrons to flow in some material, that material is a conductor, at least under the "convincing" conditions

--- End quote ---

That kind of reminds me of an older topic and a number of associated videos...

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