Question

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

• A. $v_{d} \propto E$
• B. $v_{d} \propto \frac{1}{E}$
• C. $v_{d}=$ constant
• D. $v_{d} \propto E^{2}$

Answer 1

Answer: (A)

$v_{d}=\frac{e}{m}\times \frac{V}{1}\tau$ or $v_{d}=\frac{e}{m}\cdot \frac{E 1}{1}\tau\left[\because V = E 1\right]$
$\therefore v_{d} \propto E$