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## 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 J

_{b}inside the cylinder and the curface current density K

_{b}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

**K**=

_{b}**M**x

**n^**

**J**=

_{b}**∇**x

**M**

## The Attempt at a Solution

a/ A/m

b. Inside the cylinder, the magnetization is constant so

**J**=

_{b}**∇**x

**M**=0

I don't get what they mean by the three surfaces, inside the cylinder, outside and ?

Thanks !