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Mag feild two wires opposite directions

  1. Oct 15, 2008 #1
    1. The problem statement, all variables and given/known data

    Two long, parallel wires carry currents of 20 A and 10 A in opposite directions, as in the figure below. Which of the following statements must be true? (Select all that apply.)

    In region II the field is into the page and can be zero.
    There are no points where the field is zero.
    In region I the magnetic field is into the page and is never zero.
    In region III it is possible for the field to be zero.
    In region I the magnetic field is out of the page and is never zero.


    2. Relevant equations



    3. The attempt at a solution

    i thought that the first and last statements were true because the direction of the first current is left to right and the one below it is right to left.
     
  2. jcsd
  3. Oct 16, 2008 #2

    Defennder

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    Homework Helper

    Could you provide the picture? I need to know the direction of current flow.
     
  4. Oct 16, 2008 #3
    It won't let me but the top on which is 20 a goes from left to right and the bottom one is opposite
     
  5. Oct 16, 2008 #4
    The answer is:

    X In region I the magnetic field is out of the page and is never zero.
    X In region III it is possible for the field to be zero.

    Go Pack!
     
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