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Homework Help: Magnetism Question

  1. Jan 6, 2008 #1
    1. The problem statement, all variables and given/known data

    A high voltage power line carries a current of 110 A at a location where the earth's magnetic field has a magnitude of .59 G and points to the north, 72 degrees below the horizontal. find the direction and magnitude of the magnetic force exerted on a 250-m lengh of wire if the current in the wire flows (A) horizontally toward the east (B) horizontally toward the south.

    2. Relevant equations

    F= ILB SinX

    3. The attempt at a solution
    I= 110A B= .59 x 10^(-4) L=250

    F= (110)(250)(.59 x 10^(-4))(sin -72)
    F= -1.543
    Is it correct or not! i need to know the answer. can someone please help me.
  2. jcsd
  3. Jan 6, 2008 #2
    I think you should break the magnetic field into components becasue 72 degree is not the angle between ILXB.
  4. Jan 6, 2008 #3
    how should i break it down?
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