Magnetized cylinder

  • Thread starter Dassinia
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  • #1
Dassinia
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Hello, I have an exam Tuesday and I'm solving the problems of previous years :

Homework Statement


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.



Homework Equations


Kb=Mxn^
Jb=xM

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 !
 

Answers and Replies

  • #2
marcusl
Science Advisor
Gold Member
2,797
454
The 1) top and 2) bottom surfaces of the disk, and 3) the cylindrical surface at radius a.
 

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