A) for Si increases and for Cu decreases
B) for Cu increases and for Si decrease
C) deceases for both Si and Cu
D) increases for both Si and Cu
Correct Answer: A
Solution :
| [a] Key Idea: Resistivity of a metal is directly proportional to temperature and resistivity of semiconductor is inversely proportional to temperature. |
| Resistivity of metal \[\propto \] Temperature |
| Resistivity of semiconductor \[\propto \frac{1}{\text{Temperature}}\] |
| This implies that with decrease in temperature resistivity of metal decreases while that of semiconductor increases. Here, Si is a semiconductor and Cu is a metal. |
| So, resistivity of Si increases but that of Cu decreases. |
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