I ask the child to sit on the carousel with a magnet in their hand, I place the magnetometer at the carousel’s axis of rotation, as close as possible, then I ask the child to look at the magnetometer reading – in this way I illustrate the contribution of the B dipolar hyperfine field. In the second variant, I place the child on the carousel with a charged ball in their hand, I ask them to read the reading on the magnetometer placed at the carousel’s axis of rotation, the magnetometer indicates 0. Then I turn on the carousel and ask the child to indicate the reading on the magnetometer, the child will observe the non-zero readings of the magnetometer. In this way I illustrate the B obital hyperfine field to the child