Current Electricity - Result Question 13

14. Si and $Cu$ are cooled to a temperature of $300 K$, then resistivity?

[2001]

(a) For $Si$ increases and for $Cu$ decreases

(b) For $Cu$ increases and for $Si$ decreases

(c) Decreases for both $Si$ and $Cu$

(d) Increases for both $Si$ and $Cu$

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Answer:

Correct Answer: 14. (a)

Solution:

  1. (a) For metals $P_t=P_o(1+\propto . t)$

So resistivity of copper decreases with decrease in temperature. whereas of semiconductor or $s i$ increases with decreases in temperature.