Question

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Q what do you mean by
$drift \: velocity \:$
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Answer 1

the rate of displacement of an object at a particular interval of time is known as velocity

Answer 2

velocity that a particle, such as an electron, attains in a material due to an electric field. It can also be referred to as axial drift velocity. In general, an electron will propagate randomly in a conductor at the Fermi velocity.

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In general the electrons exhibit a random motion. Thus it is assumed that electrons moving in a certain direction is approximately equal to the number of electrons moving in the opposite direction. So it is said that there is no net flow of electrons in this case, in the absence of an electric field.

But in an electric field,
while each electron exhibits a random motion, the electrons are further exerted a force on by the electric field, in an opposite direction.They get “drifted” in the direction opposite to that of the applied electric field.

DRIFT VELOCITY =Th average velocity gained by the free electrons of a conductor, with which the electrons get drifted under the influence of an electric field, applied externally across the conductor.

It is of the order of 1 mm / s = 10^(-3) m / s