Science Education Resource Center at Carleton College
Serc: Magnetism and Sound: Creating Your Own Headphones
Students will explore how magnets can create a current by making their own headphones and listening to music from their iPods.
National High Magnetic Field Laboratory
Magnet Academy: Magnetic Shunt
Magnetic shunts are often used to adjust the amount of flux in the magnetic circuits found in most electrical motors. (Java tutorial)