Question

The value of which of the following quantities increases with increase in temperature for a conductor?

• A. Relaxation time of electrons inside the conductor
• B. Drift velocity of electrons inside the conductor
• C. Conductivity of the material
• D. Resistivity of the material

Answer 1

The correct option is D Resistivity of the material

Think about which of the options will increase.
Relaxation time is the time between collisions of the electrons. If the metal ions are vibrating more frequently, then the collisions for electrons should happen more often. i.e., Relaxation time should decrease.
Drift velocity is directly proportional to relaxation time. It should also decrease.
Conductivity is also proportional to relaxation time. It will also decrease.
That leaves us with resistivity, which is the answer.