How Fast Does a Magnetic Field Propagate?

AI Thread Summary
Magnetic fields propagate at the speed of light, regardless of the medium, whether in a vacuum or through air. The strength of the magnet does not affect the propagation speed of the magnetic field. A standing magnetic field is considered a relativistic phenomenon rather than a force field akin to gravity. For a deeper understanding, Maxwell's equations and Relativistic Electrodynamics provide essential insights. Overall, the discussion emphasizes the consistent speed of magnetic field propagation and its theoretical underpinnings.
mordechai9
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How fast does the magnetic field propagate from a magnetic source? In a vacuum versus through air, etc.? Does the magnetic field propagate faster from a stronger magnet?

What is the makeup of a standing magnetic field? Electromagnetic waves or a force field more similar to gravity?
 
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mordechai9 said:
Electromagnetic waves or a force field more similar to gravity?

I can only say that both electromagnetic waves and gravity fields move at the speed of light.

i.e. If the sun suddenly stopped existing, the Earth would begin to get out of its orbit at the the same moment it became dark. (About 8 minutes)
 
That's not really an answer to the question whatsoever...
 
Yes it is. Magnetic fields move at the speed of light.
 
mordechai9 said:
How fast does the magnetic field propagate from a magnetic source?
See above.
In a vacuum versus through air, etc.?
What does that mean ? It's not even a sentence.

Does the magnetic field propagate faster from a stronger magnet?
No.

What is the makeup of a standing magnetic field?
Don't know.
Electromagnetic waves or a force field more similar to gravity?
Magnetic fields are relativistic apparitions. You can usually transform them away. So not at all like gravity.

That's not really an answer to the question whatsoever...
Not polite.

Look up Maxwell's equations and Relativistic Electrodynamics on Wiki.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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