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I tried to find any reference to an experiment like this one that I have imagined but failed to find any on Google...
I have imagined the following experiment to measure the "speed of propagation" of magnetic fields (not electromagnetic waves, but magnetic fields):
A huge electromagnet that can produce a very strong magnetic field is placed inside an almost empty warehouse. Several very sensitive high-end magnetometers of the same model are placed inside the warehouse at different distances from the huge electromagnet: some placed at a distance of 5 meters, others at a distance of 10 meters, others 20 meters, others 30 meters from the huge electromagnet. High precision measurements should then be taken to check the difference in nanoseconds between the exact time when the electromagnet is turned on and the exact time when the magnetometers at different distances detect a fluctuation in the magnetic field. Magnetometers at a farther distance from the huge electromagnet should take a few more nanoseconds to detect any fluctuation in the magnetic field than those that are at a closer distance. And that difference in nanoseconds could be used to calculate the speed of propagation of magnetic fields.
I wonder if a experiment like this was already made? I think probably yes, but I failed to find any reference to it by searching Google.
I know it's probably the same as the speed of light (speed of propagation of electromagnetic waves), but I wonder if an experiement like the one described above was ever tried.
If it's indeed the same as the speed of light then the magnetometers placed 10 meters away from the electromagnet would detect a fluctuation in the magnetic field around 33 nanoseconds after the electromagnet is turned on, and the magnetometers placed 30 meters away would detect a fluctuation in the magnetic field after 99 nanoseconds.
I just wonder if anyone ever bothered to make an experiment like that.
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