Magnetism:
Magnetorheological fluids
A magnet in mid-air
Pyrolytic graphite in mid-air
The Gauss Rifle: A Magnetic Linear Accelerator
A Curie-effect heat engine
A Magnetic Ring Launcher

Electromagnetism:
An electric motor in 10 minutes
Fun with High Voltage
A 10 minute railgun

Electrochemistry:
A plastic hydrogen bomb
Building your own solar battery.
Building a Hydrogen Fuel Cell.
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