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Metal coil - Magnetic flux

  1. Jun 8, 2007 #1
    I was reading there that if you wind a piece of metal wire into a coil it creates a magnetic field. Does this wire have to have current running through it? I know that a changing electric current creates a magnetic field but how does winding a piece of metal wire into a coil create magnetic flux?
  2. jcsd
  3. Jun 8, 2007 #2
    it doesn't create flux perse. if you have a closed loop of wire you have a surface through which the earth's magnetic field creates a flux. flux is the penetration of a field through a closed surface so maybe that's what the book means.

    and it's not a changing electric current that creates a magnetic field, just a regular current creates a magnetic field. a changing magnetic field creates a current.
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