Niobium metal becomes a superconductor when cooled below 9, Ask an Expert

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Niobium metal becomes a superconductor when cooled below 9 K. Its superconductivity is destroyed when the surface magnetic field exceeds 0.100 T. In the absence of any external magnetic field, determine the maximum current a 1.95-mm-diameter niobium wire can carry and remain superconducting.

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