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Basic magnetism on square loop question?

  1. Apr 30, 2012 #1
    A square loop carrying a current I creates its own magnetic field. Describe the forces on each side of the square loop due to its own field. What is the torque it experiences?

    My question is this. I know we can use bio savart. But for bio savart, B=uoI/2piR, what R do I use? suppose i have a square loop, the adjacent sides do create B fields that the other experiences, but if they are two consecutive sides, their distance apart is 0? Please someone help me out!!
     
  2. jcsd
  3. May 1, 2012 #2

    mfb

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    Staff: Mentor

    You have to integrate over the lines, using the distance between the point where you want to calculate the field and the point where your integral "is".
     
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