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Direction of the magnetic field

  1. Jul 21, 2017 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2017-07-22 at 10.11.37 am.png

    2. Relevant equations


    3. The attempt at a solution
    I know if the currents are going the same direction they attract. So the top 2 attract each other and the bottom two attraction each other? And then the top repel the bottom...
    I'm stuck, please help~
     
  2. jcsd
  3. Jul 21, 2017 #2

    Doc Al

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    Staff: Mentor

    Don't worry about the forces the wires exert on each other. You are asked to find the field at point P. What's the field from a current-carrying wire?
     
  4. Jul 21, 2017 #3
    Magnetic field?
     
  5. Jul 21, 2017 #4

    Doc Al

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    Staff: Mentor

    Yes. So how do you find the magnetic field surrounding a current-carrying wire?
     
  6. Jul 21, 2017 #5
    B=F/ILsinθ
    The direction is determined by right hand rule?
    mmm...I don't know, what do I do next?
     
  7. Jul 22, 2017 #6

    Doc Al

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    Staff: Mentor

    Wrong formula. Again, you are not finding the force on a current-carrying wire, but the field surrounding it.

    Read this: Magnetic Field of Current
    Yes! Read the above link.
     
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