Question

Which of the following relation is significant for metals when the temperature increases?

(a) Resistivity increases and conductivity decreases

(b) Resistivity decreases and conductivity decreases

(c) Resistivity and conductivity do not change with temperature

(d) Temperature dependence is non-linear

I had been asked this question during a job interview.

My enquiry is from Current Electricity in section Current Electricity of Physics – Class 12

Answer 1

Right answer is (a) Resistivity increases and conductivity decreases

The best I can explain: The resistivity of a metal increases and the conductivity decreases with the increase in temperature. With an increase in temperature, the free electrons collide more frequently with the metal ions. The mean collision time also decreases.