# Diff of /trunk/doc/inversion/electromagnetics.tex

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2  \chapter{Electromagnetic Fields}\label{sec:electromagnetic_fields}  \chapter{Electromagnetic Fields}\label{sec:electromagneticfields}
3  A field is a spatial distribution of a quantity.  Variations in a field can be represented graphically by directed field lines called flux lines or stream lines.  Flux lines may arise from a vortex source which causes a circulation or curl of the field around it, or from a flow source which causes a net outward flow or divergence of the field from it.\footnote{The material of this chapter -- definitions and equations and their development -- has been sourced from Cheng \cite{Cheng1989}.}  The following sections develop models that describe steady electric fields arising from static electric charges, steady magnetic fields arising from electric charges in motion, steady electromagnetic fields arising from steady electric currents in conductors, and time-varying electromagnetic fields.  A field is a spatial distribution of a quantity.  Variations in a field can be represented graphically by directed field lines called flux lines or stream lines.  Flux lines may arise from a vortex source which causes a circulation or curl of the field around it, or from a flow source which causes a net outward flow or divergence of the field from it.\footnote{The material of this chapter -- definitions and equations and their development -- has been sourced from Cheng \cite{Cheng1989}.}  The following sections develop models that describe steady electric fields arising from static electric charges, steady magnetic fields arising from electric charges in motion, steady electromagnetic fields arising from steady electric currents in conductors, and time-varying electromagnetic fields.
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