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Homework Help: Magnetic Field of Wire

  1. Feb 19, 2009 #1
    A long, current carrying wire has a radius R and current I.
    What is the magnetic field inside, and outside the wire?

    Now, if it asked what is the field a distance r from the wire, I could simply use the Law of Biot & Savart (mu.I/2.pi.r). I havn't dome electricity in a while and I am stuck on this one.

    I am sure its simple, I just need a nudge.

    Thanks guys.
  2. jcsd
  3. Feb 19, 2009 #2
    I'm currently using my PDA so no complex equations.But you'll need to use the Gaussian surface for magnetic field.
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