Niobium Metal Becomes a Superconductor (With Electrical Resistance Equal to Zero)when

Niobium metal becomes a superconductor (with electrical resistance equal to zero) when cooled below 9.00 K.If superconductivity is destroyed when the surface magnetic field exceeds 0.100 T,determine the maximum current a 5.31-mm-diameter niobium wire can carry and remain superconducting.(µ₀ = 4π × 10−⁷ T⋅m/A)

A) 2660 A
B) 423 A
C) 211 A
D) 1330 A
E) 4170 A

Correct Answer:

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