How does rubbing a magnet over iron, magnetise it?

sharp910sh · 2008-06-15T12:43:17+00:00

Any one know? I think becayse when you rub the magnet over the metal it causes something to align up, aligning up the poles? Ah i duno

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

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