I very much like the homopolar idea and the train. That reminded me of some
things that can make people wow and are fun to make using magnets.

1- A simple motor using magnets (I like to mount them on a soup can), a
battery and a coil with half the insulation stripped from the ends (so as t=
o
act like brushes and keep connecting disconnecting the battery as the coil
revolves).

2- A homemade speaker. Wrap a coil of enamel wire many turns around a
magnet. Mount it on an empty can and connect it to a computer or iPod and
listen to the sound coming from the can (you can also have them experiment
with different materials and different shapes, e.g. difference between a
soup can, and Styrofoam cups. For example the soup can will have louder but
metallic sound, the cup will be more muffled and lower volume. You will als=
o
need to determine ahead of time how many turns are needed to provide
appropriate impedance to the computer/iPod/etc





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