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Homework Help: Magnetic fields

  1. Nov 4, 2008 #1
    1. The problem statement, all variables and given/known data
    A small current loop of area A = 1.5cm^2 carries current I = 3.6mA. What torque acts on it in a lab where its magnetic moment is perpendicualr to the earth's magnetic field of
    4.2 x 10^-5
    (b) Find its angular acceleration if its rotational inertia about a diameter is 6.2gcm^2

    2. Relevant equations

    T = m x B
    m = IA

    3. The attempt at a solution
    I know that m = (.015)(.0036) = 5.4 * 10^-5.

    T = abs(5.4 * 10^-5) * abs(B) * Sin(PI/2)

    I'm a bit confused about what B is, should I use the B for Earth's magnetic field???
  2. jcsd
  3. Nov 5, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Yes, use the given B for the Earth's magnetic field.
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