The Biot–Savart law
$d\vec{B} = \frac{\mu_0}{4\pi}I\,d\vec{l} \times \hat{\mathscr{r}}/\mathscr{r}^2$: fields of straight wires, finite segments, loops on their axes, magnetic dipoles and Helmholtz coils.
About 35 minutes8 activities Paper packet
$d\vec{B} = \frac{\mu_0}{4\pi}I\,d\vec{l} \times \hat{\mathscr{r}}/\mathscr{r}^2$: fields of straight wires, finite segments, loops on their axes, magnetic dipoles and Helmholtz coils.
About 35 minutes8 activities Paper packet