Question
Physics Question on Semiconductor electronics: materials, devices and simple circuits
A strip of copper and another germanium are cooled from room temperature to 80K. The resistance of
A
each of these decreases
B
copper strip increases and that of germanium decreases
C
copper strip decreases and that of germanium increases
D
each of these increases
Answer
copper strip decreases and that of germanium increases
Explanation
Solution
The temperature coefficient of resistance of copper is positive and that of germanium is negative, therefore when copper and germanium are cooled, resistance of copper strip decreases and that of germanium increases.