Correct Answer: Option A

Explanation

The temperature coefficient of resistance is given by

α = \(\frac{\text{Increase in resistance per ºC rise in temp}}{\text{resistance at 0ºC}}\)

  And for metals where resistance increases with temperature rise, the temperature coefficient of resistance is positive; on the other hand, in semiconductors, where resistance decreases with temperature rise, the temperature coefficient of resistance is negative.

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