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Current in a rectangle on a hinge

  1. Mar 2, 2013 #1
    29_46.gif
    1. The problem statement, all variables and given/known data
    Figure 29-36 shows a rectangular, 15-turn coil of wire, 10 cm by 5.0 cm. It carries a current of 0.90 A and is hinged along one long side. It is mounted in the xy plane, at an angle of 30° to the direction of a uniform magnetic field of 0.50 T. Find the magnitude and direction of the torque acting on the coil about the hinge line.



    2. Relevant equations

    [itex]\tau[/itex]=μ × B
    μ=NiA

    3. The attempt at a solution

    I dont know how to approach this. I tried to plug in numbers into ^ formula
     
  2. jcsd
  3. Mar 2, 2013 #2

    TSny

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    If you'll show more details of how you tried the calculation, we will be able to see where you're having trouble.
     
  4. Mar 2, 2013 #3
    τ=μ × B
    μ=NiA

    τ=NiABsin30
    τ=(15)(.9)(.1*.05)(.5)sin30

    τ=.16875 Nm
     
  5. Mar 2, 2013 #4

    TSny

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    See if you can figure out why the 30o is not correct here. You'll need to think about the direction of [itex]\vec{\mu}[/itex]
     
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