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Homework Help: Ampere's circuital law problem

  1. Nov 10, 2009 #1
    I Posted this earlier, but didn't get a reply =(

    1. The problem statement, all variables and given/known data
    Check link. (i1 and i2 are in the same direction. And the formula for field due to straight long wire is to be used.) https://www.physicsforums.com/showthread.php?p=2434701#post2434701

    2. Relevant equations

    General magnetic field due to a straight long current at point P=μ0i/2πr(r=perpendicular distance between the conductor and the point P)

    3. The attempt at a solution

    I just need some hints to work on. Please help!


    These are the steps I came up with:
    1)Find B1 due to conductor carrying i1
    2)Find B2 due to conductor carrying i2(taking distance as (d-r))
    3)Subtract the two to get net field.

    But how do I eliminate the i2 from the expression??

    And B is non-uniform in the problem, so this approach is incorrect anyway=( Please help!
  2. jcsd
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