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Homework Help: Cube cross product qustion

  1. Aug 21, 2009 #1
    i need to figure out the size and direction of the force on each segment


    in cd segment there is a 45 degree between the electricity and magnetic field
    so i need to have size 40*sin 45

    why they write only 40
  2. jcsd
  3. Aug 21, 2009 #2
    am i correct?
  4. Aug 21, 2009 #3


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi krot! Welcome to PF! :wink:

    Your picture shows a cube with an electric circuit along adjacent j and k edges, and returning along ij and ik face-diagonals, with a uniform magnetic field in the j direction.
    you would only need 40sin45º if the diagonal was 40 …

    it isn't!! :smile:
  5. Aug 21, 2009 #4


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    Staff: Mentor

    krot's been caught. He's a previously banned member.
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