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← ScienceWhich mechanism causes zero resistance when niobium-titanium wire cools?
A)Cooper pairing creates a condensate✓
B)increased electron–phonon scattering dissipates energy
C)increased lattice defects scatter electrons
D)thermal expansion improves electron flow
💡 Explanation
Electron pairs (Cooper pairs) form a macroscopic quantum state (condensate), therefore conduction occurs without scattering; rather than resistance, there's zero electrical resistance below critical temperature because individual electrons lose momentum.
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