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Two wires, where is magentic field zero?

  1. Feb 20, 2009 #1
    1. The problem statement, all variables and given/known data
    Two wires carry current I1 = 53 A and I2 = 37 A in the opposite directions parallel to the x-axis at y1 = 3 cm and y2 = 13 cm. Where on the y-axis (in cm) is the magnetic field zero?

    I1= 53 A
    I2=37A


    2. Relevant equations

    B(r)=Iu/[2(pi)r]

    3. The attempt at a solution

    I thought i could solve this guy by setting the strengths of the fields equal to each other and finding r. Much of it would cancel out so I basically had

    53u/(2[pi]r)=37u/(2[pi](10-r)

    [(10-r)*53]/r=37

    r=5.88

    and then I added 3 to r since the starting position is y=3. It made sense to me but obviously i messed up somewhere.
     
  2. jcsd
  3. Feb 20, 2009 #2

    LowlyPion

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    Homework Helper

    If the current in the wires is going in opposite directions what do the field vectors do in the distance between the 2 wires?
     
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