Eh-8 The Meisner Effect
Published: Tuesday 14 March 2006 - Updated: Thursday 19 April 2007
Aim
To demonstrate magnetic levitation due to the Meisner effect.
Apparatus
- Samarium Cobalt magnet
- Ceramic Superconductor
- Liquid Nitrogen Dewer
- TV camera
- Superconductor stand
Diagrams
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Videos
Meisner Effect |
Description
The high temperature superconductor has a transition temperature of 88 degrees Kelvin. This temperature is considerably above that of Liquid Nitrogen (77degrees Kelvin). A superconductor has the property of preventing magnetic field penetration. This magnetic exclusion or Meissner effect comes about by the generation of an equal and opposite magnetic field in the superconductor. The induced field repels any outside field so a light magnet will float or levitate on this field.