A child holding an electrically charged ball is sitting on a carrousel and as a result, the ball performs a circular motion, this leads to the orbital contribution.
We can also use the bar magnet, the presence of this bar magnet (f.ex. lying next to the carrousel) leads to the dipole contribution.
The magnetometer can be used to measure the contributions to the magnetic hyperfine field.
If the ball is thrown towards the middle of the carrousel, maybe we can also have the Fermi contact contribution?