Here are the rules from when Shock Value was a trial event:http://soinc.org/sites/default/files/up ... kvalue.pdf
The official rules should be a bit different, but generally the same topics.
What it says about magnetism is,
"iv) Basic magnetism concepts (e.g. North and South poles, Earth's magnetic field, electromagnet
principles, magnetic vs. nonmagnetic materials, magnet shapes / types)
v) Basic magnetic applications (e.g. use of a compass to determine directions / poles of a magnet,
operation of an electromagnet, use of magnets in motors)"