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I just heard someone say a superconducting electromagnet does not produce heat, which I find very strange, since it seems that, since rate of heat energy being dissipated = voltage^2/resistance. Taking the limit as resistance goes to 0, with voltage held constant, power approaches infinity. I remember reading that resistance is not

*exactly*zero, but it's very close, so it stands to reason that this low of a resistance should produce a ton of heat. Hence, confusion.

Thanks for your help.