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- \chapter{Magnetics}
-
- \section{Linear approximation}
-
- Linear induced magnetism. For low values of $\kappa$, the induced field can be approximated. For higher suceptibilities for for
- remanance furthur corrections are needed, see section \
- \[
- \nabla^2 u = \nabla \cdot \kappa \mathbf{H}
- \]
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