Resistive timescale: Difference between revisions

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Ohm's Law,
Ohm's Law,
:<math>\vec E = \eta \vec j,</math>
:<math>\vec E = \eta \vec j,</math>
where ''&eta;'' is the resistivity (assumed homogeneous), and Ampère's Law,
where ''&eta;'' is the [[:Wikipedia:Spitzer_resistivity|resistivity]] (assumed homogeneous), and Ampère's Law,
:<math> \vec \nabla \times \vec B = \mu_0 \vec j,</math>
:<math> \vec \nabla \times \vec B = \mu_0 \vec j,</math>
one immediately derives a diffusion type equation for the magnetic field:
one immediately derives a diffusion type equation for the magnetic field:

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