Question

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

• A. $\mathrm { v } _ { \mathrm { d } } \propto \mathrm { E }$
• B. $\mathrm { v } _ { \mathrm { d } } \propto \mathrm { E } ^ { 2 }$
• C. $\mathrm { v } _ { \mathrm { d } } \propto \sqrt { \mathrm { E } }$
• D.

Answer 1

Answer: (A)

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

Answer 2

: $v _ { d } = \frac { I } { n A e } = \frac { J } { n e } = \left( \frac { \sigma } { n e } \right) E$