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 ? $\endgroup$ Commented Feb 20, 2015 at 14:06
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$\begingroup$ 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. $\endgroup$– DK2AXCommented Feb 20, 2015 at 18:46
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$\begingroup$ So is there any material that does not need low temp to make transion to superconductor ? $\endgroup$ Commented Feb 21, 2015 at 7:25
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$\begingroup$ Thanx @andynitrox u answer all of my questions thanks man . Btw can I have ur email or something ? $\endgroup$ Commented Feb 21, 2015 at 8:51
