define drift velocity and derive an expression for it.

Ans. Drift velocity is defined as the average velocity with the free electrons get drifted towards the positive end of the conductor under the influence of an external electric field applied.

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Ans. Drift velocity is defined as the average velocity with the free electrons get drifted towards the positive end of the conductor under the influence of an external electric field applied..
E =V/l...
... ...
F= -e E..
... ...
a = -eE/m..
... ... ...
v1 =u1+a .t1. ..(t1=time elapsed t is tau..)
similarly...
v2. v3. v3 VN ...
drift velocity = -eE t/m....
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