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Homework Help: Finding the magnitude of the force and direction.

  1. Feb 19, 2014 #1
    1. The problem statement, all variables and given/known data

    A long wire carrying 6.50A of current makes two bends. The bent part of the wire passes through a uniform 0.280T magnetic field directed as shown in the figure and confined to a limited region of space.
    Part A: Find the magnitude of the force that the magnetic field exerts on the wire.
    Part B: Find the direction of the force that the magnetic field exerts on the wire.

    here is the link for the figure. http://s16.postimg.org/li2tzpa4l/yg_20_92.jpg
    2. Relevant equations


    3. The attempt at a solution

    I= 6.50A, B= 0.280T, and l=0.8m(I did the Pythagorean theorem to find the lenght)


    F= 1.456N.

    I found the force, but I got the answer wrong. Can someone explain where did I go wrong? I'm confuse with this problem.
  2. jcsd
  3. Feb 19, 2014 #2


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    Staff Emeritus
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    The length you have is wrong.

    80 cm of wire is at a 30° angle to the "horizontal", but there is also some length that is "horizontal" .

    Furthermore, the force vectors from those two (or three) segments are not in the same direction.


    Attached Files:

  4. Feb 19, 2014 #3
    ok so I think I figured out how to approach this problem. Thanks
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