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 an external magnetic field, determine the maximum current a 2.00-mm-diameter niobium wire can carry and remain superconducting.

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Ankit LalLv10

22 Nov 2020

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In a certain region of space near Earth's surface, a uniform horizontal magnetic field of magnitude B exists above a level defined to be y=0. Below y=0, the field abruptly becomes zero. A vertical square wire loop has resistivity ρ, mass density ρ_(m), diameter d, and side length l. It is initially at rest with its lower horizontal side at y=0 and is then allowed to fall under gravity, with its plane perpendicular to the direction of the magnetic field.

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chocolatehorse686

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