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Hi, magnetic properties question please.

  1. Aug 30, 2006 #1
    :rolleyes: Can anyone tell me the main attributes of:
    a loud speaker magnet?
    a compass needle?
    In terms of permeability, remanence etc.
    many thanks
  2. jcsd
  3. Sep 1, 2006 #2


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    Homework Helper

    these are both intended to be permanent magnets.
    compass needles do not need to be strong, just stable.
    speaker magnets should be strong (even with zero applied field), but
    should not change strength very much even with an external applied field.
  4. Sep 1, 2006 #3
    many thanks
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