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Q.

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement?

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a

Resistance of both decreases

b

Resistance of both increases.

c

Resistance of copper increases while that of germanium decreases.

d

Resistance of copper decreases while that of germanium increases.

answer is D.

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Detailed Solution

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Resistance of conductors (Cu) decreases with decrease in temperature while that of semiconductors (Ge) increases with decrease in temperature.

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