Abstract
A “skier” on a superconducting disk skies along a track by levitating above a magnetic strip. This is the reverse of the usual demonstration in which a small rare Earth magnet is levitated above as superconducting disk.
Portable
Yes
Principles Illustrated
Properties of superconductors. This is the reverse of the more common experiment in which a small rare Earth magnet is levitated above a superconducting disk.
Video
Download video (right-click and “save link as”, 141 KB):
Levitate-skier.m4v
NCEA & Science Curriculum
Properties of superconductors
Instructions
Cool the skier in liquid nitrogen and place on the track
Safety
If you are not trained in the use of liquid nitrogen and confident with it, ask a university physics or chemistry department for help. Wear liquid nitrogen safety gear (particularly goggles) and use plastic forceps to lift skier in and out of the liquid nitrogen. Only a few ml of liquid nitrogen are needed to cool the skier.
Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.
Related Resources
- Floating Magnet
- How Cold is Liquid Nitrogen
References
The superconductor used in this demonstration was made in a research lab but similar materials are available from other suppliers.
Teaching Resources
Would you like to contribute lesson suggestions? Contact us.
Credits
This teaching resource was developed with support from
The MacDiarmid Institute
Faculty of Science, Victoria University of Wellington
School of Chemical and Physical Sciences, Victoria University of Wellington