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Magnetic Field from two parallel wires

  1. Mar 18, 2016 #1
    1. The problem statement, all variables and given/known data
    Each of two long straight parallel wires separated by a distance of 24.0 cm carries a current of 5.00 A
    in the same direction. What is the magnitude of the resulting magnetic field at a point that is 14.0 cm
    from each wire?

    2. Relevant equations
    U0I/2pir
    U0I/4pia(cos(theta) -cos(theta2))
    B1 + B2 =B

    3. The attempt at a solution
    I have tried (U0I/2pir)2 as well as U0I/4pia(cos(theta) -cos(theta2)) Where theta 1 is approx 30 and theta 2 is approx 150. r in both equations have been .14. I have also tried U0I/2pi(.14) + U0I/2pi(.24-.14). And a series of other variations which never yield close to the given potential answers. Been working on this for 5 days now.
     
    Last edited by a moderator: Mar 18, 2016
  2. jcsd
  3. Mar 18, 2016 #2

    Charles Link

    User Avatar
    Homework Helper

    The calculation of the magnetic field is solved for each wire separately using Ampere's Law. This is a vector problem and it can help to draw a diagram with the current from the two wires flowing into the plane of the paper. The magnetic field from each wire is in a circular clockwise direction around each wire when the electrical current points into the plane of the paper.
     
    Last edited: Mar 18, 2016
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