Q. For which of the following dependences of drift velocity $v_{d}$ on electric field $E$ , is Ohm's law obeyed ?

5409 220 Current Electricity Report Error

A

$v_{d} \propto E$

63%

B

$v_{d} \propto E^{2}$

12%

C

$v_{d} \propto E$

10%

D

$v_{d} \propto \frac{1}{E}$

15%

Solution:

$v_{d} = \frac{I}{n A e} = \frac{J}{n e} = (\frac{σ}{n e}) E$