# Pre-Quantum Electrodynamics
Author: Jean-Sébastien Caux

#### Steady Currents: the Biot-Savart Law
ems.ms.BS

Steady currents lead to constant magnetic fields: {\bf magnetostatics}.

Then, since \(\frac{\partial \rho}{\partial t} = 0\), the continuity equation leads to \[ {\boldsymbol \nabla} \cdot {\bf J} = 0 \label{Gr(5.31)} \]

##### In this section:

- The Magnetic Field issuing from a Steady Current ems.ms.BS.sc

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Author: Jean-Sébastien Caux

Created: 2022-02-09 Wed 22:40