Q. 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) $v_{d} \propto E^{2}$
Explanation
(a) $v_{d} = \frac{e}{m} \times \frac{V}{l}\tau$ or $v_{d} = \frac{e}{m}.\frac{El}{l}\tau\ \lbrack\therefore V = El\rbrack$
$\therefore v_{d} \propto E$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.