Obtain the relation between the terms drift velocity, relaxation time and electric field

Asked by Harimahi73 | 21st Feb, 2019, 08:53: PM

Expert Answer:

In conductor, average time between two consecutive collisions of electron with ions at the lattice sites is defined as relaxation time. It is assumed that electron after collision forgets it’s past motion and starts a fresh with zero velocity. The force due to electric field produced by voltage difference is eE. The acceleration is (eE/m). The velocity acquired by the electron in time t is called drift velocity, Vd. Then,                         ( ma = eE => a= eE/m)

Vd=(eE/m)t.

Answered by Ankit K | 22nd Feb, 2019, 10:30: PM