Question

Obtain an expression for drift velocity of electron in a conductor

Answer 1

Force = qE

F = -eE

ma = -eE

a = $-\frac{eE}{m}$ .......(1)

$\tau$ $\to$ Average time difference between two collision

V = u + at

$V_d=0+\frac{-eE}{m}\tau$

$V_d=-\frac{eE\tau }{m}$

$V_d$ = drift velocity