1.

As the temperature increase, the electrical resistance : (1) decreases for both conductors and semiconductors (2) increases for conductors but decreases for semiconductors (3) decreases for conductors but increase for semiconductors (4) increases for both conductors and semiconductors.

Answer»

(2) increases for conductors but decreases for semiconductors

For conductors a is (+)ve 

For semiconductors & Insulators a is (–)ve



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