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Sphere of magnetic material in an applied field

  1. May 14, 2009 #1
    1. The problem statement, all variables and given/known data

    Consider a sphere of magnetic material with radius R and magnetisation M in an applied field [tex]B_{applied}[/tex]. Find an expression for:

    a) the total current flowing around the surface of the sphere;
    b) the net field at the centre of the sphere.


    2. Relevant equations

    dc24d89951a6d45b451723626c34ba38.png


    3. The attempt at a solution

    I am totally new to the magnetisation physics, and am having trouble getting to grips with it, any pointers on how to go about solving this?
     
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. May 19, 2009 #2
    [tex]I=\int J.dS = \int (\nabla \times M).dS = 4\pi R^{2}M[/tex]

    Is this correct without [tex]
    B_{applied}
    [/tex]? If so, what happens when [tex]
    B_{applied}
    [/tex] is present?
     
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