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  4. A piece of copper and another of germanium are cooled from room temperature to text77 textK . The resistance of

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Q. A piece of copper and another of germanium are cooled from room temperature to $\text{77 } \text{K}$ . The resistance of

NTA AbhyasNTA Abhyas 2022

Solution:

Copper is a conductor.
Germanium is a semiconductor
When cooled, the resistance of copper decreases and that of germanium increases.