Quick Answer: The Ring Launcher Model demonstrates electromagnetic induction and Lenz’s law. A copper coil run on 220V AC induces a current in an aluminium ring, and the repulsion launches the ring up a central iron rod.
Last updated: October 2026
Key Features
Primary copper coil operated on 220V AC
Central iron rod that guides the ring upward
Two aluminium rings supplied: one closed and one open
Mounted on a base for classroom demonstrations
Technical Specifications
Specification
Value
Supply
220V AC
Coil
Copper primary coil
Core
Central iron rod
Rings
Two aluminium rings (open and closed)
About This Product
The jumping ring shows how a changing magnetic flux induces a current in a nearby conductor and how that current’s field opposes the change, pushing the ring away. Comparing the closed ring, which jumps, with the open ring, which barely moves, shows that induction needs a complete circuit. It also helps explain eddy currents and Faraday’s law in electricity and magnetism lessons.
Frequently Asked Questions
Why does the open ring not jump?
The open ring has no complete path for current, so little or no current is induced and it shows little or no jump compared with the closed ring.
