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Homework Help: Concentric Arcs (Biot Savart)

  1. Oct 15, 2007 #1
    1. The problem statement, all variables and given/known data
    The closed loop shown in the figure below carries a current of 6.90 A in the counterclockwise direction. The radius of the outer arc is 65.0 cm, that of the inner arc is 41.0 cm. Find the magnitude of the magnetic field at point P if the angle 60 deg.

    2. Relevant equations
    [tex] db=\frac{uI dl x r}{4\pi r^3}[/tex]
    dl and r are vectors
    x means cross product

    3. The attempt at a solution
    Basically integrate the outer wire, the inner wire and add them up right?

    Attached Files:

  2. jcsd
  3. Oct 15, 2007 #2


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    Staff Emeritus
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    You will have to split the question into 4 parts to find the contribution of the 4 different sections. The cross product is useful here as it simplifies the different parts greatly.
  4. Oct 15, 2007 #3
    I figured it out.
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