Niobium metal becomes a superconductor when cooled below 9 K. Its superconductivity is destroyed when the surface magnetic field exceeds 0.100 T. What is the maximum current that a 1.50 mm diameter niobium wire can carry and remain superconducting in the absence of any external magnetic field?
A) 113 A
B) 225 A
C) 375 A
D) 425 A
Correct Answer:
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