Question

Statement I : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Statement II : On increasing temperature, conductivity of metallic wire inecreases.

• A. Both statement I and II are correct.
• B. Both statement I and II are incorrect.
• C. Statement I is correct but statement II is incorrect.
• D. Statement II is correct but statement I is incorrect.

Answer 1

Answer: (C)

On increasing temperature of wire the kinetic energy of free electrons increase and so they collide more rapidly with each other and hence their drift velocity decreases. Also when temperature increases, resistivity increases and resistivity is inversely proportional to conductivity of material.