- Sections
- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
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- P. Modern Physics
I7-21. Superconductivity - Magnet Levitation
Purpose
To demonstrate levitation of a magnet above a high-temperature superconductor.
Equipment
One-inch superconducting disc on conducting base in styrofoam container of liquid nitrogen, 0.2" cube samarium cobalt magnet, tweezers.
Suggestions
TV is available on request for large groups.
Setup Time
5 minutes.
Images
Description
A one-inch diameter superconducting disc is set on a conducting base in a bath of liquid nitrogen. A cubic samarium cobalt magnet levitates above the superconductor. Note that to show the Meissner effect you must place the magnet on the disc before cooling it down. When the superconductor passes through its transition temperature the magnet rises up by itself and levitates.
References
E. Bochenek, R. Fischer, and H. Voigt, Conception and Operation of a Meissner-Ochsenfeld
Effect Motor with High Tc Superconductors, Journal of Less-Common Metals, 151, 473-480
(1989). P. J. Ouseph, Meissner oscillator, AJP 57, 955-956 (1989). Raymond E. Benenson,
Demonstration of Magnetic Images, TPT 29, 54-55 (1991). E. Guarner and A. M. Sanchez,
The Superconducting Bird: A Didactical Toy, TPT 30, 176-179 (1992).
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See pagesi1. thermal properties of matter
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See pagesi2. transfer of heat
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See pagesi3. gases
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See pagesi4. changes of state
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See pagesi5. laws of thermodynamics
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See pagesi1. thermal properties of matter
-
See pagesi2. transfer of heat
-
See pagesi3. gases
-
See pagesi4. changes of state
-
See pagesi5. laws of thermodynamics
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