Square Wires

Discussion in 'Homework Help' started by f74bat, Dec 1, 2008.

  1. f74bat

    Thread Starter Member

    Nov 26, 2008
    13
    0
    our long, straight wires are parallel to each other and their cross-section forms a square. Each side of the square measures 0.0112 m.


    [​IMG]

    If each wire carries a currrent of 8.33 A in the direction shown, find the magnitude of the total magnetic field at P, the center of the square.


    For this question I tried using B=(mu*I)/(2*pi*d) and multiplying the answer by 4 cuz there are 4 sides but my answer is not correct.
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You have to assume a positive direction of current flow. Say the dot is the positive direction and the cross is the negative direction. Thus find B each wire causes at point P and then add them together. According to, the assumptions, the right-bottom wire will give a negative B and the other wires positive B.
     
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