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Cylindrical conductor

  1. Nov 15, 2007 #1
    why is the magnetic field just inside a cylindrical conductor with inner radii a, and outer radii b carrying a uniform current I distributed throught it's croos section just 0 inside the conductor.
    I used ampere's law and that surely doesn't give 0
     
  2. jcsd
  3. Nov 16, 2007 #2
    a current produces a magnetic field whose lines of force form circles around the wire carring the current. every loop (of field lines) must inclose a current and there is no current in the hollow part of the wire.
     
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