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Title: Physics: electricity and magnetism? Post by: datageekgh on Jun 8, 2012 If u place a metal ring in a region in which a magnetic field is rapidly alternating, the ring may become hot to your touch. WHY????
Title: Physics: electricity and magnetism? Post by: lgorman20101 on Jun 8, 2012 Eddy currents.
Title: Physics: electricity and magnetism? Post by: darwin on Jun 8, 2012 The continuously changing magnetic field induces currents in the metal. (Eddy currents)
The currents flowing in the metal produce heating. (The Joule effect) A well known school demonstration of this has the ring with a groove in it. The groove is filled with water, which is rapidly brought to the boil. Title: Physics: electricity and magnetism? Post by: nzp123 on Jun 9, 2012 a ferrous metal that has it's molecules lined up in the same direction is magnetized.... with the alternating current you cause those molecules to switch the north and south poles of the magnetic field like 60 times a second for a 60hertz ac charge... the constant alternating and rotating of the molecules causes the metal to heat up from friction.... eddy currents
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