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Homework Help: Torque and magnetic field

  1. Jan 16, 2010 #1
    1. The problem statement, all variables and given/known data

    Rectangular loop with resistance R is spinning with angular velocity ω in the homogeneous magnetic field with a density of B. What is the electric current flowing on the loop? With what average torque do we have to turn the loop?

    Picture: http://item.slide.com/r/1/254/i/Cs-60nN37T_tSYvw3YSe_Qmz8ovH2qaG/ [Broken]

    2. Relevant equations

    V= ω*sin(ωt)*B*S
    I= V/ R
    τ= m*B

    3. The attempt at a solution

    p(m)= S*I
    p(m)= (ω*S²*B* sin(ωt))/ R
    m= p(m)*B*sin(φ)= p(m)*B*sin(ωt)
    m= (S²*B²* ω*sin(ωt)²)/ R

    τ= m*B

    Are my equations correct?:confused:

    Thank you for helping!:smile:
    Last edited by a moderator: May 4, 2017
  2. jcsd
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