Module 3 : MAGNETIC FIELD
Lecture 20 : Magnetism in Matter
   
\includegraphics[width=\textwidth]{fig3.52.eps}
   
  We define magnetization $\vec M$ of a sample as the net magnetic moment per unit volume. The unit of magnetization is Ampere/meter. From the figure it can be seen that the surface current flows along the side faces. Denoting the normal to the face by $\hat n$, the surface current density $\vec K$ (in A/m) is given by
 
\begin{displaymath}\vec K = \vec M\times\hat n\end{displaymath}
   
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