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Question

A piece of copper and another germanium are cooled from room temperature to 80 K. The resistance of.

A
Each of them increases
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B
Each of them decreases
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C
Copper increases and germanium decreases
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D
Copper decreases and germanium increases
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Solution

The correct option is D Copper decreases and germanium increases
[D] As temperature decreases, resistance decreases in case of copper (conductors) & increases with decrease of temperature in case of germanuim
(semi conductor.)

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