I have been trying to conceive of experiments that would give a different result based on if a magnetic field was created by only the electrons in a wire, or also created by the protons in a wire dependant on relative velocity.
I have thought of many that do not even need testing and furnish the result that the electric field moving does not create a magnetic field, and that the protons shouldn't create the field SR would expect. Anyway here is one I find interesting based on the Hall effect. Basically if the magnetic field from a coil is only produced by the electrons, then the magnetic field from the electrons would be moving with the electrons at their drift velocity. If you now have a hall effect censor that has a current through the hall sensor that in parallel to this magnetic field and in the same direction, then the electrons in the hall effect censor would have little or no relative velocity (assuming same drift speed) to the electrons providing the magnetic field under test. And hence little or no hall effect voltage. But if the direction of the current is reversed in either the hall effect sensor or the electromagnet, then suddenly a voltage should be found suddenly, or grow larger if a tiny result was initially detected. However if the electrons moving with the electrons on the other wire saw the protons making a magnetic field, this result would not take place. I hope this is not too hard to test as it could be a very illuminating experiment. John
