A) increases, thermal velocity of the electron increases
B) decreases, thermal velocity of the electron increases
C) increases, thermal velocity of the electron decreases
D) decreases, thermal velocity of the electron decreases
Correct Answer: B
Solution :
[b] When the temperature increases, resistance increases. As the e.m.f. applied is the same, the current density decreases the drift velocity decreases. But the rms velocity of the electron due to thermal motion is proportional to \[\sqrt{T}.\] Therefore, the thermal velocity increases
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