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Homework Help: Coil in field

  1. Mar 14, 2010 #1
    1. The problem statement, all variables and given/known data

    A circular coil having 20 turns and a radius of R = 12.8 cm carries a current of 2.70 A. It is placed in a uniform magnetic field of 60.0 mT. The initial angle between the magnetic moment of the coil μ and the magnetic field B is 26.0o.
    1)Calculate the magnetic dipole moment of the coil.
    2)What is the magnitude of the torque acting on the coil?
    3)How much work is required to rotate the coil so that the B-field lies in the plane of the coil?

    2. Relevant equations

    x=uo M/B

    3. The attempt at a solution
    so I solved for uo by using the equation uo=NAI and got 2.779 but now I do not know what to do and if the equation my professor gave is correct. Then on parts 2 and 3 I don't know where to begin.
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 15, 2010 #2
    I got part one and part 2. I think I misunderstood the problem because part one is asking for uo which I solved for and got 2.78 A*m^2 which was correct. Then with this I can find the torque for part 2 with the equation T=uoBsin(theta). So I used this equation and I got 7.31E-2 N*m which was correct. Now I have part 3-how much work is needed-to solve for and i am not sure what I am supposed to do.
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