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A piece of copper and other of germanium are cooled from the room temperature to $80 K$ , then

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resistance of copper will increase while that of germanium will decrease

resistance of copper will decrease while that of germanium will increase

resistance of copper will decrease

resistance of each will increase

answer is D.

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Detailed Solution

Copper is a conductor, so, its resistance decreases on decreasing temperature as thermal agitation decreases whereas germanium is semiconductor, therefore, on decreasing temperature resistance increases.

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