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## Homework Statement

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.

## Homework Equations

## 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?

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