Once the magnetic vector potential is computed, the magnetic field can easily be computed via the equation below:
<math> \mathbf{H(r)} = - \frac{1}{\mu} \nabla \times \mathbf{A} (\mathbf{r})</math>Â Â EM.Ferma can also compute magnetic fields from line sources via the Biot-Savart Law:Â <math> \mathbf{B(r)} = \frac{\mu_0}{4\pi}\int_C \frac{I d\mathbf{l} \times \mathbf{\hat r}}{|\mathbf{r}|^2}</math>
== Sources in EM.Ferma ==