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.
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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