goodboy
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put a iron beside a magnet,then we konw the iron would be attracted toward the magnet.but where does the kinetic energy of the iron come from?
Where does the energy come from?
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Tomsk
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The iron is in a magnetic field, hence it has potential energy due to its position. This becomes KE when the iron is released. The total energy, KE+PE, is conserved.
Tomsk
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Actually, I just read this thread: https://www.physicsforums.com/showthread.php?t=130549. Looks like I'm wrong then...
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You are now wrong. You were right the first time. For a permanent magnet and ferromagnetic iron, the energy considerations do work just as they would in electrostatics with a charge attractilng a polarizable object.Tomsk said:Actually, I just read this thread: https://www.physicsforums.com/showthread.php?t=130549. Looks like I'm wrong then...