A. their resistance decrease with temperature
B. The resistance increase with temperature
C. their resistance is constantly changing with temperature
D. they have electrons and holes at high temperature
Correct Answer:
Option A – their resistance decrease with temperature
Explanation
Temperature coefficient of resistance is given by
α = Increase in resistance per oC rise in temp./resistance at 0°C
And for metals where resistance increase with temperature rise, temperature coefficient of resistance is positive; on the other hand in semi conductors, where resistance decrease with temperature rise, temperature coefficient of resistance is negative.
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