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Homework Help: Magnetized cylinder

  1. Oct 12, 2013 #1
    Hello, I have an exam Tuesday and I'm solving the problems of previous years :

    1. The problem statement, all variables and given/known data
    Consider a disk of radius a and length h of permanent magnetization M = Moz parallel to h.
    a/ what are the units of Mo ?
    b/Find the magnetic current density Jb inside the cylinder and the curface current density Kb on the three surfaces.
    c/ Write boundary conditions of B and H for the three surfaces.
    d/ Plot field lines for B and H everywhere.

    2. Relevant equations

    3. The attempt at a solution
    a/ A/m
    b. Inside the cylinder, the magnetization is constant so
    Jb=xM =0
    I don't get what they mean by the three surfaces, inside the cylinder, outside and ?

    Thanks !
  2. jcsd
  3. Oct 12, 2013 #2


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    Science Advisor
    Gold Member

    The 1) top and 2) bottom surfaces of the disk, and 3) the cylindrical surface at radius a.
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