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How does a DC current polarize

  1. Apr 20, 2009 #1
    from my understanding polarization is a way of causing objects to be diametrically opposed (North and South poles for example)

    What I don't understand is how a DC current polarizes a metal. Obviously for something to be magnetic it MUST be polarized but why does a DC current have to be used, why cant it be an AC current???

    Thanks
     
  2. jcsd
  3. Apr 20, 2009 #2
    An AC current when coiled around a magnetic capable material continually switches poles with each repeating cycle. This disrupts the magnetizing process. A DC current keeps the same polarity so that the material can align its atoms and so take on the magnetic property.
     
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