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Homework Help: Magnetic Force of a wire

  1. Apr 13, 2008 #1
    1. The problem statement, all variables and given/known data
    A segment of wire carries a current of 62 A along the x-axis from x=-6m to x=0 and then along the z-axis from z=0 to z=2.9m. The magnetic field is equal to 110 mT in the positive z direction.

    What is the magnitude of the force on this segment of wire? Answer in units of N.


    2. Relevant equations

    F=ILBsin[tex]\theta[/tex]

    F= magnetic force
    I= current
    L= length of wire
    B= magnetic field
    sin[tex]\theta[/tex] = the angle

    3. The attempt at a solution

    First I tried finding the length of the hypotenuse of the wire and the angle, then use the other given variables to solve for F, but I didn't think that was right.
     
  2. jcsd
  3. Apr 13, 2008 #2
    do you really mean that both the wire and the magnetic field is along the z-axis (and not the y-axis)? If both are along the z-axis, no force will will act on that part.
     
  4. Apr 13, 2008 #3
    I think the only part of the wire that matters is the part that isn't parallel to the magnetic field (ie from -6 to 0 along the x axis, which is perpendicular to the field).
     
  5. Apr 13, 2008 #4
    Yes, it is the z-axis, not the y.

    So is the equation just going to be F=6x62x0.11?
     
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