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Homework Help: Problem on the magnetic force on a wire

  1. Jul 24, 2013 #1
    1. The problem statement, all variables and given/known data

    A wire 42.1 cm long carries a 0.660 A current in the positive direction of an x axis through a magnetic field with an x component of zero, a y component of 0.000330 T, and a z component of 0.00840 T. Find the (a) x, (b) y, and (c) z components of the magnetic force on the wire.

    2. Relevant equations

    Force on a wire:

    3. The attempt at a solution

    Seems simple, but im getting a wrong answer.

    a. 0 (this is correct)
    b and c. 0.660*(crossP({0.66,0,0}, {0,0.000330,0.00840})={0,-0.00365904,1.43748E-4}

    and niether -0.00365904 (y component, part b),
    nor 1.43748E-4 (z component, part c)

    are correct.
  2. jcsd
  3. Jul 24, 2013 #2


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    Homework Helper
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    2017 Award

    Check the number that you used for the length of the wire.
  4. Jul 24, 2013 #3

    rude man

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    Do your cross-products again. Show us the details thereof. (Set up the customary determinant rather than your more obscure notation).

    EDIT: follow TSny's advice! I hadn't noticed that you omitted the length.
    Last edited: Jul 24, 2013
  5. Jul 25, 2013 #4
    Thanks! I did not see that one!
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