Physics, asked by Tanyaaaaa8751, 1 year ago

Relation between drift velocity and relaxation time derivation 12 class physics

Answers

Answered by sanafebruary02
33

This is the answer.plz mark as brainliest

Attachments:
Answered by fistshelter
37

Drift velocity is the small average velocity of free electron along the direction of positive potential and is denoted by v_{d}

In conductor average time between two consecutive collisions of electrons with ions at the lattice sites is called relaxation time and is denoted by ​τ.

We know F = m.a

and also F = q.E = -e.E

m.a = -e.E

a = \frac{-e.E}{m}   .....(i)

We also know v_{d} is average velocity and hence is equal to

Note:- It is assumed that electron after collision forgets it’s past motion and starts a fresh with zero velocity

v_{d} = a. τ            .....(ii)

Combining (i) and (ii)

we get v_{d} = \frac{-e}{m}.E.τ

Similar questions