This page from the Institute of Physics, aimed at algebra-based physics course level and above, features a straightforward tutorial on the force on a moving charge; an impressive demo called "Catapult Magnetic Field", and tips for leading class discussions on factors affecting electromagnetic force. Direction of force in a magnetic field can be a tough concept for even the brightest students. The Catapult Magnetic Field lab requires copper wire, "Magnadur" magnets (available for ~$15 for a set of 4), soft modeling plasticine, support blocks, and heavy cardboard, and iron filings. When electricity is applied to the system, the Magnadur magnets produce a uniform, parallel magnetic field. The current-carrying copper wire produces a circular magnetic field around itself. When the two fields are combined, the pattern produced by the iron filings indicates a complex field pattern. The wire will be "catapulted" from the stronger-to-weaker field.

This page is part of a larger collection from IOPSpark that presents findings from academic literature about the conceptions (and misconceptions) young people have regarding processes in the physical world. See Related Materials for a link to the full collection.