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)

$v _ { d } \propto E$

Answer 2

$v _ { d } = \frac { e } { m } \times \frac { V } { l } \tau$ or $v _ { d } = \frac { e } { m } \cdot \frac { E l } { l } \tau$ (Since $V = E l )$

$\therefore v _ { d } \propto E$