Do mass and charge always go hand in hand for magnetism?

AI Thread Summary
Mass and charge are not strictly linked in the context of magnetism. It is not necessary to have mass to possess a charge, as demonstrated by particles like electrons. Conversely, a charged particle is not required to exhibit magnetic properties, as seen with neutrons, which are neutral yet possess a magnetic moment due to their quark composition. The discussion highlights the distinction between fundamental and composite particles in relation to these properties. Understanding the interplay between mass, charge, and magnetism requires consideration of both types of particles.
Tony Stark
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Is it necessary -
1. to have mass for having a charge?
2. to have charge in order to magnetic property?
 
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Re: 2. A neutron is electrically neutral and has a magnetic moment. However it has quarks that are charged. So I don't know if you are limiting your question to fundamental particles or are considering composite particles also.
 
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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