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Why poles of machine are always even?

  1. Dec 3, 2012 #1
    why poles of machine are always even?
     
  2. jcsd
  3. Dec 3, 2012 #2
    Assuming you are talking about motors, these are magnetic poles which always come in pairs. Every north pole has a corresponding south pole.

    If you wind wire around a nail to make an electromagnet, you have created 2 poles.
     
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