Q. 214.3( 49 Votes )

Derive the expres

Answer :

When conductor is subjected to an electric field E, each electron experiences a force.
and acquires an acceleration
a = F/m = - eE/m ________ (1)
Here m = mass of election, e = charge, E = electric field.
The average time difference between two consecutive collisions is known as relaxation time of election.

_____________ (2)

As v=u + at (from equation of motion)

The drift velocity v is defined as

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