Question

The resistance of a metal wire increases with increasing temperature on account of,,,,, A) Decrease in free electron density B) Decrease in relaxation time C) Increase in mean free path D) Increase in the mass of electron

Answer 1

Answer:

increase in the mass of electron.

Answer 2

Answer: B) Decrease in relaxation time

Explanation:

• When we heat a conductor the electrons start gaining more energy and starts colliding with each other more frequently.
• Due to which the relaxation time of the electrons decreases.
• And the resistance of the metal wire increases with the increase in temperature.
• Hence, the required answer is option B.

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