Why doesn't a super cooled superconductor generate usable electricity due to the phenomenon of electromagnetic induction when placed upon a magnet? I basically mean, why can't it create electricity by using the Meissner effect and electromagnetic induction?

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What a superconductor in a magnetic field does is create (by Lenz's Rule) a current that creates a magnetic field which in turn pushes the external field outside of the volume of the superconductor. Since such a material has no resistance, you have no heat losses that would decrease the internal current. To answer your question, a superconductor does produce electricity in a magnetic field, but that is used to levitate it.

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  • $\begingroup$ can this electricity be used for other purposes other than levitation ? $\endgroup$ – Jayant Chhillar Feb 20 '15 at 14:06
  • $\begingroup$ You could use it in the same way that coils of copper wire are used in a generator. It is fundamentally nothing different, only that the resistance is zero. You might have seen that a magnet falls slowly, like in a viscous fluid, when link it is falling through a copper tube. So, by building a generator that uses superconducting wires instead of copper wires, you end up with a higher efficiency, which is partly offset by the power you need to cool the superconductor down to when it reaches that superconducting state. $\endgroup$ – ahemmetter Feb 20 '15 at 18:46
  • $\begingroup$ So is there any material that does not need low temp to make transion to superconductor ? $\endgroup$ – Jayant Chhillar Feb 21 '15 at 7:25
  • $\begingroup$ There is a lot of research going on at the moment to find a superconductor at room temperature. So far, "high temperature superconductors" range around something like -150°C, so this is still pretty cold. link $\endgroup$ – ahemmetter Feb 21 '15 at 8:47
  • $\begingroup$ Thanx @andynitrox u answer all of my questions thanks man . Btw can I have ur email or something ? $\endgroup$ – Jayant Chhillar Feb 21 '15 at 8:51

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