Meissner Effect and Application of Meissner EffectPublished on 24/2/2015 & updated on 31/7/2018
Meissner StateThis state of the superconductor is also called Meissner state. An example of Meissner effect is shown in figure below. This Meissner state breaks when the magnetic field (either external or produced by current flowing superconductor itself) increases beyond a certain value and sample starts behaving like an ordinary conductor.
This certain value of magnetic field beyond which superconductor returns to ordinary state is called Critical Magnetic Field. The value of the critical magnetic field depends on temperature. The value of the critical magnetic field increases when the temperature below the critical temperature reduces. The figure below shows the variation in the critical magnetic field with temperature.
Application of Meissner EffectThis effect of superconductivity, is used in magnetic levitation which is the base of modern high-speed bullet trains. In superconducting state (phase), due to expulsion of external magnetic field, the sample of superconducting material levitates above magnet or vise-versa. Modern high-speed bullet trains use the phenomenon of magnetic levitation.
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