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Air core Coils vs. Metal core coils

  1. Apr 2, 2006 #1
    Hi, I have a quick question. I was just wondering which type of coil is best for inducing electricity. If I pass a magnet over one end of the coil, would a metal core help more current to be induced or would an air coil be better?

    Jason O
  2. jcsd
  3. Apr 2, 2006 #2


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    Science Advisor

    Since the metal core helps increase the flux density, and the magnetic fields will decrease in strength exponentially with distance, the metal core seems the logical choice. A metal core is used in transformers where the entire purpose is to properly induce a current in the secondary coil based on the magnetic field induced in the core.
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