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Demagnetization of a permanent magnet

  1. Feb 28, 2009 #1
    When we magnetize a ferromagnetic material, we provide an input of energy. Is it possible to demagnetize a magnet, and convert a fraction of the energy to usable work? (Of course, this is not a useful way to generate work, and some fraction of the input energy is lost)
     
  2. jcsd
  3. Mar 1, 2009 #2

    Vanadium 50

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    Why do you say this?
     
  4. Mar 1, 2009 #3
    It would be true to say that energy is required to change a specific state of a system into another, specific state which does not currently exist.
    Whether energy is to be "imparted" or "removed" or "dissipated" depends on the desired end-state.
     
    Last edited: Mar 1, 2009
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