Will the drift velocity of free electron in a metallic conductor increase or decrease with the increase in temperature?

Asked by Arti Chauhan | 12th Jan, 2013, 04:32: AM

Expert Answer:

vd = (TeE)/m

where

vd = is drift velocity

e = charge of electron

E = electric field

m = mass of electron

T = relaxation time

 which implies that drift velocity is directly proportional to relaxation time.

 Relaxation time is the time interval between successive collisions of an electron during its flow in a conductor. On increasing temperature, the electrons move faster and more collisions occur quickly.

Hence relaxation time decreases with increase in temperature

 which implies that drift velocity also decreases with temperature.

Answered by  | 12th Jan, 2013, 07:29: PM

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