Question

2. Define drift velocity. Derive an expression for drift velocity.
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Answer 1

Answer:

Drift velocity is defined as the average velocity attained by the particles (electrons) of a given material due to an electric field that is proportional to current. Ohm's law can be expressed in terms of drift velocity as follows: u=μE. Where, u: drift velocity (m/s)

Answer 2

Answer:

drift velocity: average velocity attained by charged particles, such as electrons, in a material due to an electric field.

Explanation:

$v_{d}=\frac{I}{n e A$

v_{d} = drift velocity

I = current flow

n = free electron density

e = charge of an electron

A = cross sectional area

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