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Question
Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of ______.
Options
both increases.
both decreases.
copper increases and silicon decreases.
copper decreases and silicon increases.
Solution
Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of copper decreases and silicon increases.
Explanation:
The resistance of copper wire increases with temperature, which causes a drop in conductivity, while the resistance of silicon wire reduces with temperature, which causes an increase in conductivity.
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