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A wire of aluminium and a wire of germanium are cooled to a temperautre of $77 \mathrm{~K}$. Then
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resistance of aluminium wire decreases and that of germanium wire increases
If wire of aluminium and a wire of germanium are cooled to a temperature of $77 \mathrm{~K}$ the resistance of $\mathrm{Al}$ decreases and resistance of $\mathrm{Ge}$ increases.
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