A) each of them increases
B) each of them decreases
C) copper decreases and germanium increases
D) copper increases and germanium decreases
Correct Answer: C
Solution :
We know that resistance of conductor is directly proportional to temperature\[(i.e.,R\propto \Delta t)\]while resistance of semiconductor is inversely proportional to temperature\[\left( i.e.,R\propto \frac{1}{\Delta t} \right)\]. Therefore, it is clear that resistance of conductor decreases with decrease in temperature or vice-versa, while in case of semiconductor, resistance increases with decrease in temperature and vice-versa. Since, copper is pure conductor and germanium is a semiconductor hence, due to decrease in temperature, resistance of conductor decreases while that of semiconductor increases.
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