Write the expression for the drift velocity of charge carriers in a...

Question

Write the expression for the drift velocity of charge carriers in a conductor of length $L$ across which a potential difference $V$ is applied.

Accepted Answer

Electric field $E = V/L$, so drift velocity:
$$v_d = \frac{eV	au}{mL}$$
where $e$ = electron charge, $	au$ = relaxation time, $m$ = mass of electron.