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Homework Help: Determine the magnitude and direction of the total force on the wire.

  1. May 19, 2010 #1
    1. The problem statement, all variables and given/known data

    Problem 27.7
    A stiff wire 52.0 cm long is bent at a right angle in the middle. One section lies along the z axis and the other is along the line y=2x in the plane. A current of 20.5 A flows in the wire-down the z axis and out the line in the xy plane. The wire passes through a uniform magnetic field given by B=(0.318i)T .

    (a) : Determine the magnitude and direction of the total force on the wire.
    (b) : Find the ange theta = ,,,,,, below the negative y-axis

    2. Relevant equations

    F = I l B sin(theta)
    F = I lxB

    3. The attempt at a solution

    Length L = 35(2) *(-k) +35(2) cos 65 i + 35(2) sin 65 j
    = 29.58 i + 63.44 j - 70 k
    magnetic field B = 0.318 i
    current i = 20.5 A
    force F = i ( L X B )
    but there is some thing wrong !!
    i don't know wher ,, maybe with the angle theta !!

    Please help and thanks for trying to help me .
  2. jcsd
  3. May 19, 2010 #2
    HeLp PLeaSe ,,, i'm WaiTing
  4. May 20, 2010 #3


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Welcome to Physics Forums.
    Consider each wire half separately, and get the force acting on each half of the wire.
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