First slide

Drift velocity

Question

Drift velocity $v_{d}$ varies with the intensity of electric field as the relation :

Moderate

A

$v_{d} \propto E$
B

$v_{d} \propto \frac{1}{E}$
C

$v_{d} = constant$
D

$v_{d} \propto E^{2}$

Solution

$v_{d} = \frac{e}{m} \times \frac{V}{1} τ or$
$v_{d} = \frac{e}{m} \cdot \frac{E 1}{1} τ [∵ V = E 1]$
$∴ v_{d} \propto E$

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