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Homework Help: Magnetic Force direction

  1. Oct 12, 2009 #1


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    1. The problem statement, all variables and given/known data

    What is the magnetic force on a wire 0.25 m long, carrying a current of 4.0 A, when placed in a uniform magnetic field of 0.50 T, at an angle of 45 to the wire?

    2. Relevant equations

    3. The attempt at a solution
    this question doesn't make sense to me
    it said"when placed", so the wire should be placed in the uniform magnetic field, but at an angle of 45 to the wire,
    if it is to the magnetic field, it will make more sense
    i am confused...
  2. jcsd
  3. Oct 12, 2009 #2


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    Homework Helper

    If the wire is placed so the magnetic field is at 45 degrees to the wire, then the wire is 45 degrees to the magnetic field. Anyway, just B*cos(45) to get the component of the field that is perpendicular to the current.
  4. Oct 12, 2009 #3


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