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Homework Help: Calculating magnetic field of an infinite strip.

  1. Jun 30, 2012 #1
    1. The problem statement, all variables and given/known data
    Given an infinite long (in the z-direction), with width 2b in the y-direction and no thickness in the x-direction. There is a current with density J in the z-direction.
    Calculate the magnetic field on the y axis if |y| > b.

    2. Relevant equations
    Amperes law: ∫B*dS = μ0*I

    3. The attempt at a solution
    My first thought was that the strip is build out of infinite wires, so according to the right hand rule the magnetic field would be in the negative x-direction for y > b and the positive x-direction for y < -b. But I see no possibility to choose a suiting ampere path.
  2. jcsd
  3. Jun 30, 2012 #2


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    Science Advisor
    Homework Helper

    Hi Berrius! :smile:
    (use ds for length, not dS, or the examiner may think you mean area)
    so integrate! :wink:
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