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Electromagnets and magnetic field.

  1. Aug 28, 2009 #1
    Many real motors use electromagnets to create the magnetic field that causes their rotor to spin. Give one advantage and one disadvantage of building a motor which uses electromagnets rather than permanent magnets.
     
  2. jcsd
  3. Aug 28, 2009 #2

    kuruman

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    What is the basic and most fundamental difference between an electromagnet and a permanent magnet?
     
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