In a field less than critical field, decreasing the temperature below the critical temperature will eliminate the magnetic field inside a superconductor and increase the magnetic field around it. (Meissner effect). But does it related to levitation effect of magnet on a superconductor? What makes it float in air?

  • $\begingroup$ In a textbook the effect is explained this way: "The diamagnetic nature of a superconductor has some interesting mechanical consequences. For a diamagnetic material the magnetization is in the opposite sense, and a diamagnetic material is repelled by a permanent magnet." (University physics). I wonder why it mentions diamagnetism? A diamagnetic material is slightly repelled by magnet but the mechanism is different from the effect of the Faraday's law of induction. Is the levitation due to diamagnetism? $\endgroup$ – Kelvin S May 1 '15 at 15:15
  • $\begingroup$ I have another question as the induced current creates an internal magnetic field that exactly cancels the external field. If the superconductor behave like this it is actually a very strong electromagnet and it also has its north and south pole. Why it can be levitated so stably while a permanent magnet cannot? $\endgroup$ – Kelvin S May 1 '15 at 15:49

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