Question

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 1

(2) increases for conductors but decreases for semiconductors

For conductors a is (+)ve 

For semiconductors & Insulators a is (–)ve