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← ScienceWhen a Josephson junction's oxide barrier narrows, which phenomenon dominates current flow?
A)Quantum tunneling increases sharply✓
B)Thermal excitation overcomes resistance
C)Capacitive reactance becomes infinite
D)Magnetic flux induces back EMF
💡 Explanation
Quantum tunneling dominates at very thin barriers because electrons pass through despite the barrier via wave function overlap; therefore the current jumps rather than decreasing because thermal effects are less significant here.
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