Question

By increasing the temperature, the specific resistance of a conductor and a semiconductor- 

(i) increases for both. 

(ii) decreases for both. 

(iii) increases for a conductor and decreases for a semiconductor. 

(iv) decreases for a conductor and increases for a semiconductor.

Answer 1

Answer is (iii) increases for a conductor and decreases for a semiconductor.

Specific resistance of a conductor increases and for a semiconductor decreases with increase in temperature because for a conductor, a temperature. 

coefficient of resistivity α = + ve 

and for a semiconductor, α = -ve