Teaching Minds-On Experiments on Electromagnetism in Secondary Schools

Permanent magnets
Atomic force microscope model (reference to a practical application)

In the experiment shown below, we present a model of atomic force microscope. A thin metal belt (used in anti-robbery shop systems) is moving slow and attracting to the blue "paper" three times.
There are placed three magnets under the paper and they attract real the metal belt. In the same way works atomic force microscope.