Quick Answer: The Lenz’s Law Apparatus STEM Lab shows electromagnetic braking: a neodymium magnet takes several seconds to fall through a vertical conducting metal tube, while a mass-matched non-magnetic slug drops straight through.
Last updated: October 2026
Key Features
Vertical high-conductivity metal guide tube, outer diameter approx. 25 mm
Neodymium magnet cylinder and a mass-matched non-magnetic cylinder for a control run
Dropping the non-magnetic slug first shows ordinary free fall; the magnet then drifts down at a slow, steady speed. As it falls, its field induces eddy currents in the tube wall whose own field pushes back against the motion, which is Lenz’s law at work and a direct lead-in to Faraday’s law and energy conservation. The Lenz’s Law Apparatus STEM Lab can be supplied on export terms to Maldives, Italy, Zimbabwe, Serbia and Antigua and Barbuda.
Frequently Asked Questions
Why are two slugs supplied with the Lenz’s Law Apparatus STEM Lab?
The non-magnetic slug has the same mass as the magnet, so its quick fall acts as a control that shows the slow fall of the magnet is due to induced currents, not gravity.
