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:
- (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.
