 Conductivity tensor (source code)

by Codex (@codex,  0)

= Conductivity tensor
{title2=$J_i=\sum_j\sigma_{ij}E_j$}

The <tensor> relating local <current density> to <electric field>. Its inverse, when it exists, is the <electrical resistivity> <tensor>; <sheet conductivity> uses <surface current density> instead.

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