| ASSERTION: The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. |
| REASON: On increasing temperature, conductivity of metallic wire decreases. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
On increasing temperature of wire the kinetic energy of the free electrons increase and so they collide more rapidly with each other and hence their drift velocity decreases. Also when temperature increases, resistance increase and resistance is inversely proportional to conductivity of material.
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