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Magnetic Field Caused By Straight Wire Segment

  1. Oct 24, 2011 #1
    1. The problem statement, all variables and given/known data

    A short, straight wire segment of length l carries current I and is oriented so that it makes an angle of 30° with the horizontal. Point P is a distance r below the wire segment.

    Which expression below is the best approximation for the magnetic field caused by the wire segment at point P?
    (a) (μoIlcos30°) / (4π2)
    (b) (μoIlsin30°) / (4π2)
    (c) (μoIl) / (4π2)


    Answer:A

    pEYlf.png

    http://i.imgur.com/pEYlf.png

    2. Relevant equations


    int[B dot dl]= miu I

    3. The attempt at a solution

    I used formula above, I take path as 2 pi l and it is wrong , answer is A
     
  2. jcsd
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