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Magnetostatics - force on wire

  1. Mar 30, 2010 #1
    1. The problem statement, all variables and given/known data
    A segment of wire carries a current of 20 A
    along the x axis from x = −6 m to x = 0 and
    then along the z axis from z = 0 to z = 7.2 m.
    In this region of space, the magnetic field is
    equal to 51 mT in the positive z direction.
    What is the magnitude of the force on this
    segment of wire?

    2. Relevant equations
    Fb= ILBsintheta

    3. The attempt at a solution
    Fb = ( 20 A ) (7.2m ) ( .051m )

    the question asked for " the magnitude of the force on THIS SEGMENT of wire" so i thought to just plug in 7.2m but it turned out to be wrong so i added the 6m as well but it was wrong again. help =[
  2. jcsd
  3. Mar 31, 2010 #2
    Re: Magnetostatics

    i have another question

    A proton moving at 1.2 × 106 m/s through a
    magnetic field of 4.3 T experiences a magnetic
    force of magnitude 4.9 × 10−13 N.
    The charge of proton is 1.60218 × 10−19 C
    and the mass of proton is 1.67262 × 10−27 kg.
    What is the angle between the proton’s
    velocity and the field?
    Answer in units of ◦.

    Is this question simply just plugging the values into Fb = BILsintheta and solve for theta? it seems too easy to be true.
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