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Homework Help: Wire Magnetic Field Question

  1. Jul 20, 2004 #1
    I cannot figure how this works..

    A wire carries a 7.00 A current along the x-axis and another wire carries a 6.00 A current along the y-axis. What is the magnetic field at point p located at x=4.00m and y=3.00m.

    Since each wire carries its own magnetic field, my instinct is saying that I just need to add the magnitude of the two fields. But that doesn't seem correct.

    A speedy reply would be greatly appreciated.
     
    Last edited: Jul 20, 2004
  2. jcsd
  3. Jul 20, 2004 #2

    Doc Al

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    Staff: Mentor

    That's all there is to it. Be sure you have the correct sign (direction) of each field when you add them.
     
  4. Jul 20, 2004 #3
    So would the direction of the field in the y-direction be negative and the direction in the x-direction be positive?

    I guess I would end up with something like....

    Bnet = Bx - By

    Sounds easy enough for me.
     
  5. Jul 20, 2004 #4

    Doc Al

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    Staff: Mentor

    The current along the y-axis creates a field (at the point in question) that is in the -z direction; the current along the x-axis creates a field in the +z direction.
     
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