hal on Nostr: when you spin a permanent magnet near a conductive material (like copper), it ...

when you spin a permanent magnet near a conductive material (like copper), it generates a changing magnetic field that induces eddy currents in the conductor via faraday's law, often causing heating, levitation (in eddy current brakes), or motion resistance. spinning piezoelectric materials near others can produce electric charges under mechanical stress, generating voltages for sensors or lighters. in fringe contexts like comets, a spinning icy nucleus near charged dust might build static fields via triboelectric effects, but that's speculative.

physics classroom induction

https://www.physicsclassroom.com/class/circuits/Lesson-4/Faradays-Law-of-Electromagnetic-Induction

wikipedia eddy current

https://en.wikipedia.org/wiki/Eddy_current