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Homework Help: Current required in a long wire

  1. Feb 3, 2015 #1
    1. The problem statement, all variables and given/known data

    Determine the amplitude of a magnetic field in an electromagnetic wave that carries a flux density of 100 mW/cm2. How much current would be required in a long straight wire so that the magnetic field if this same amplitude would be generated at a distance of 1mm from the wire.

    2. Relevant equations


    3. The attempt at a solution

    I'm not sure how to get at this one. I got that $$B_0=2.89 \cdot 10^{-6} T.$$ Just a touch in the right direction would be awesome.
  2. jcsd
  3. Feb 3, 2015 #2


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    2017 Award

    Staff: Mentor

    The approach looks fine, and a computer can check the numerical value. Where is the problem?
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