Question

For which of the following dependences of drift velocity $v_d$ on electric field $E$, is Ohm's law obeyed ?

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

Answer 1

Answer: (A)

$v_{d}=\frac{I}{nAe}=\frac{J}{ne}=\left(\frac{\sigma}{ne}\right)E$