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Find the magnetic field of an infinite uniform surface

  1. Oct 14, 2015 #1
    1. The problem statement, all variables and given/known data
    This example is from 3rd edition of Griffiths' textbook. Ex. 5.8 on page 226
    I understand that by reversing the direction of the current, sign of B is switched. but i can't get it that highlighted part. and why B doesn't have z-component???

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 14, 2015 #2
    You didn't show equation 5.39.
    But doesn't the law take the form I dL X r.
    Try this with any infinitesimal current current element.
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