Question

Let $J$ is the current density at a point in a conductor and $\vec{E}$ the electric field there. Further $n$ is the number density of charge carriers, $e$ the charge on them, $m$ is their mass, $\tau$ the relaxation time. Then, $J$ is equal to

• A. $\frac{n{e}^2\tau }{2m}\vec{E}$
• B. $\frac{n{e}^2}{m\pi }\vec{E}$
• C. $\frac{n{e}^2\tau }{m}\vec{E}$
• D. $\frac{n\tau \vec{E}}{m{e}^2}$

Answer 1

Answer: (C)

As stated.