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Homework Help: Inertia and magnetic moment

  1. Apr 8, 2014 #1
    1. The problem statement, all variables and given/known data
    For any flat object, located in the x-y plan applies to the equation:

    where Ix,Iy,Iz is the moments of inertia about the x-axis, y-axis and z-axis.
    A flat circular coil has n windings and radius r. The mass of the coil is m. The coil is located in the x-y plan centered on (0,0). The coil moment of inertia about the z-axis is called Iz

    a) Give a formula of Iz. Also specify a formula for Ix and Iy.

    The coil has one turn. The current in the coil is I.
    b) Give the magnetic moment μ of the coil.

    3. The attempt at a solution

    a+b) I am thinking of using the definition of the magnetic moment of a current loop, but i cant get further, can someone help please?
  2. jcsd
  3. Apr 9, 2014 #2
    Kind of a strange question since it asks two completely different questions:

    a) Do you know formula for the mass moment of inertia for a ring?

    b) Yes, simply use the definition for a magnetic moment of a coil.
  4. Apr 9, 2014 #3
    a) Do you know formula for the mass moment of inertia for a ring?

    Is it K= rootof(Ic/m)?
  5. Apr 9, 2014 #4
    No, it's Iz we're after.
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