Quick Answer:The Eddy Current Model (Disc Type) has a conducting aluminium or copper disc turning on a ball-bearing spindle and a U-magnet that can be moved closer to the disc, to show magnetic braking by eddy currents.
Last updated: 18 October 2026
Key Features
High-conductivity aluminium or copper disc.
Low-friction ball-bearing spindle.
Adjustable-proximity magnetic yoke / U-magnet.
Neodymium or ferrite permanent magnets.
Heavy, powder-coated base.
Technical Specifications
Specification
Value
Disc
Aluminium or copper
Magnets
Neodymium or ferrite permanent magnets
Bearing
Ball-bearing spindle
Brake
Adjustable-proximity magnetic yoke / U-magnet
Base
Powder-coated cast iron or weighted alloy
How It Is Used
The disc is spun freely and the magnet is then brought towards it: eddy currents induced in the moving disc oppose its motion and it slows quickly, more strongly the closer the magnet. The model links Faraday's law and Lenz's law with practical magnetic braking.
Frequently Asked Questions
How does the Eddy Current Model (Disc Type) slow the disc?
As the disc turns past the poles of the U-magnet, eddy currents are induced in it. Their field opposes the motion, so the disc brakes, and moving the magnet closer increases the effect.
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