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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.

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Why can't we directly relate the magnetic field $ \bf B$ to the electric field $\bf{E}$ usin...

Why can't we directly relate the magnetic field ${\bf B}$ to the electric field ${\bf E}$ using the equation $\nabla \times {\bf B} =\mu_0 \sigma {\bf E}$? In my understanding, a steady electric fiel …
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