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B-field at point P that is produced by the current in two wires

  1. Mar 29, 2013 #1
    1. The figure shows an end view of two long, parallel wires perpendicular to the xy-plane, each carrying a current I=5.00A but in opposite directions. What is the magnitude and direction of the B-field at point P that is produced by the current in the two wires?



    2. B=(μo/4pi) integral from +infinity to -infinity (I/r^2)(dl x r^)
    Biot-Savart Law
    B=μoI/2pi(r)

    3. I am having a very hard time trying to understand this problem; but this is my attempt which is not complete.
    At first I was going to get my B total by Adding B1 + B2 getting each by using the second formula on top. This just doesnt seem right.
    Second attempt was getting B1 and B2 using the second formula. Then to get the B field I was going to do B=sqrt of B1^2 + B2^2
    but I cannot figure out how to get direction?
    Please Help!
     

    Attached Files:

  2. jcsd
  3. Mar 29, 2013 #2
    Resolve the Magnetic field vectors ( along the axes) and then add them vectorially.
     
  4. Mar 29, 2013 #3

    rude man

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    Why not? Just pay attention to the signs.
    2nd attempt - forget it! The fields add. The system is linear!
     
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