Choose the correct relation between drift velocity (a) and current density (J) from the following:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $v_d=\frac{J}{ne}$
The current is related to number of charge carries (n) and drift velocity $(v_d)$.
$I=nAev_d$
and,
Current Density $(J) = \frac{nAev_d}{A}$
$J=nev_d$
$⇒v_d=\frac{J}{ne}$