A piece of copper and a piece of germanium are cooled from room temperature to $80 K$ . Then, which one of the following is correct?

Resistance of each will increase

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Resistance of each will decrease

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Resistance of copper will decrease while that of germanium will increase

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Resistance of copper will increase while that of germanium will decrease

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Solution

The correct option is C Resistance of copper will decrease while that of germanium will increase
Copper is a conductor and so its resistance decreases with decrease in temperature where Germanium is a semiconductor and thus its resistance increases with decrease in temperature.

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