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

question 78

Multiple Choice

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

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