5K20.23 Eddy Current Ramps
Faraday's law, Lenz' law, magnetic fields from currents
A magnet sliding down a copper ramp is slowed by magnetic fields from eddy currents induced in the tube. A magnet sliding down a Plexiglas ramp is unaffected. A magnet sliding down a brass ramp goes faster than on the copper ramp due to the higher resistivity of the brass damping the currents.
-  Ramp holder
-  Copper, Plexiglas, and brass ramps
-  Rare earth magnets
- Mount the appropriate ramps at the desired slant at the labelled locations.
- Make sure the magnets don't slam into each other. They can break when that happens.
- Slide a magnet down the Plexiglas ramp. Remove the magnet.
- Ask for predictions on what will happen with the copper ramp.
- Slide a magnet down the copper ramp. Remove the magnet.
- Ask for predictions on whether the magnet will slide down faster on the brass or copper ramp.
- Slide magnets down the copper and brass ramps simultaneously.
- PIRA 5K20.23
- Don't attempt this at home!
- Eddy current tubes
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.