A) resistance of both the wires decreases
B) resistance of both the wires increases
C) resistance of copper wire decreases and that of silicon wire increases
D) resistance of copper wire increases and that of silicon wire decreases
Correct Answer: D
Solution :
Copper is a metal whereas silicon is a semiconductor. The temperature coefficient of resistance is positive for metals and negative for semiconductor. Therefore, the resistance of copper wire increases and that of silicon wire decreases as the wires are heated.
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