Question

The resistance of a metallic conductor increases with temperature because

• A. Free electron density increases
• B. Conductor expands
• C. Number of collisions between electrons carriers increases
• D. Number of collisions between electrons and vibrating ion core of the conductor increases.

Answer 1

Answer: (D)

With the increase of temperature of a metalic conductor, the average collision time for electrons decreases. In other way, number of collisions between electrons and vibrating ion cores of the conductor increases, with the increase in temperature, hence its resistance increases