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Drift Velocity - Practice Questions & MCQ
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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Drift Velocity is considered one of the most asked concept.
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10 Questions around this concept.
Solve by difficulty
A potential difference is applied to a copper wire of length and radius . If is doubled, the drift velocity
Two cylindrical rods of uniform cross-sectional area and 2, having free electrons per unit volume 2 and , respectively, are joined in series. A current flows through them in steady state. Then the ratio of drift velocity o free electron in left rod to drift velocity of electron in the right rod (1/) is
A straight conductor of uniform cross section carries a current I. Let s be the specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to their drift velocities only, is
A potential difference is applied to a copper wire of length
and thickness
If the thickness is doubled, the drift velocity becomes
Concepts Covered - 1
Drift Velocity
Relaxation time (): The time interval between two successive collisions of electron with the Positive ions.
Mean Free path: The path between two consecutive collisions is called free path. The average length of these free paths is called “Mean Free Path”.
Drift velocity
Drift velocity is the average velocity that a particle such as an electron attains in a material due to an electric field.
Where is the drift velocity, E is the electric field applied, e and m are the charge and mass of electrons respectively and
is the relaxation time.
- Vd is directly proportional to E:
when the temperature is constant , the greater the electric field larger will be the drift velocity
Drift velocity and current
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Current independent of Area: Current does not change with change in cross-sectional area
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Vd is inversely proportional to area:
:
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Drift velocity varies inversely with the area of cross-section
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