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Question on Magentic Field

  1. Apr 19, 2009 #1
    So Im trying to understand why the answer is zero for this problem.

    Calculate the magnetic field at the center of the square.

    The figure shows 4 circles with Xs (which I understand indicates, magnetic field direction is going into the page) forming into a square, if that makes any sense.

    Please explain to me why the magnetic field is zero.
     
  2. jcsd
  3. Apr 19, 2009 #2

    LowlyPion

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    Are the circles with X's in the corners possibly currents all going into the page?

    Or are you saying that there are 4 flux lines at each corner going into the page?
     
  4. Apr 20, 2009 #3
    The circles with the Xs in the corners are currents all going into the page.
     
  5. Apr 20, 2009 #4

    LowlyPion

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    Well then what is the magnetic field about a current in a wire?

    What is the B-field from each of the currents? And more importantly how are they directed?
     
  6. Apr 24, 2009 #5
    Thanks someone explained it to me...

    (x)1 (x)2




    (x)3 (x)4

    From RIGHT HAND RULE.
    So the magnetic field on 1,2,3,4 are all clockwise. So 1 will be canceling out with 3 and 2 will be canceling out with 4. Therefore, there is no magnetic field.
     
  7. Apr 24, 2009 #6

    LowlyPion

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    There you go. You got it.
     
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