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Magnetic field of a Coaxial Cable

  1. Mar 13, 2013 #1
    1. The problem statement, all variables and given/known data

    A long coaxial cable consists of two concentric conductors with dimensions a = 1.20 cm, b = 5.40 cm and c = 7.30 cm. There are equal and opposite currents of 5.00 A in the conductors. Find the magnitude of the magnetic field at a distance of 0.36 cm from the center axis.

    2. Relevant equations

    [itex]\oint[/itex]B*dl=μ_0*I_enclosed


    3. The attempt at a solution

    Far as i can tell because the outer portion of the wire is not enclosed I enclosed for that portion of the problem is 0 so:

    B=I*r[itex]/[/itex]2∏a2

    But I'm not getting the right answer.

    Any help would be greatly appreciated
     

    Attached Files:

    Last edited: Mar 13, 2013
  2. jcsd
  3. Mar 14, 2013 #2

    mfb

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    2016 Award

    Staff: Mentor

    0.36cm is within the inner cable - just some fraction of the 5A current flow in the inner wire is enclosed in your integral.
    You can assume that (electric) current density is constant in the wire.
     
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