1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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:
    F=i*(crossP(L,B))

    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

    TSny

    User Avatar
    Homework Helper
    Gold Member

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

    rude man

    User Avatar
    Homework Helper
    Gold Member

    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!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Problem on the magnetic force on a wire
  1. Magnetic force on wire (Replies: 7)

Loading...