Electromagnet which produces varying magnetic flux

AI Thread Summary
To create an electromagnet that produces varying magnetic flux, the current supplied to the power source must change over time. Copper wire is the most commonly recommended material for the windings due to its excellent conductivity. The choice of wire material does not significantly affect the ability to change the magnetic flux. The key focus should be on how the current is modulated rather than the wire itself. Understanding these principles is essential for effective electromagnet design.
Sharlom
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I want to make an electromagnet but it should
Produce magnetic flux which changes with time.
What material wire would be the best to make make windings?
 
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The usual choice is copper.
 
The way to make the flux change with time is to make the current at the power supply change with time. The magnet coil's material - usually copper - shouldn't enter into it.
 
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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