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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
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vote
Would my fridge magnet drop off on a non-magnetic planet?
Of course not.
Magnetic forces are created because of the electron arrangement of the metal.
Not the planet's core or whatever.
Its the magnet, material, and the electron arrangement which matters.