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Which mechanism causes a resistanceless state when using a superconducting quantum interference device (SQUID) at critical temperature?

A)Cooper pair formation
B)Josephson junction tunneling
C)Phonon-mediated attraction
D)Flux quantization effects

💡 Explanation

Josephson junction tunneling allows paired electrons through a thin insulating barrier, creating a supercurrent; because of this quantum effect, SQUIDs show zero resistance up to a critical current, therefore enabling high sensitivity, rather than general conductivity increases.

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