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This simple looking device detects north magnetic poles.
Turn it on and the green LED lights up. Bring a magnet next to the LED end of the detector and if the magnet is oriented with its north pole touching the white mark, the LED will go out. If it is the opposite pole that is pointing toward the device, the LED will be unaffected.
The detector employs a Hall Effect semiconductor that responds to a magnetic field by increasing its output voltage when one pole is brought nearby and reducing its output when the opposite pole is introduced.
Show your students how it works but don't tell the science behind it. What theories can they come up on their own? Devloped by Ralph Fudge.
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