Niobium metal becomes a superconductor (with zero electrical resistance) when cooled below 4.6 K. The permeabilty of free space is 1.25664 × 10-6 N/A². If superconductivity is destroyed when the surface magnetic field exceeds 0.05 T, deter- mine the maximum current a 1.7 mm diame- ter niobium wire can carry and remain super-
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