Question

When the current $i$ is flowing through a conductor, the drift velocity is . If $2 i$ current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be

• A. $v / 4$
• B. $v / 2$
• C.
• D. $4 v$

Answer 1

Answer: (C)

Answer 2

$v _ { d } = \frac { J } { n e }$ ⇒ $v _ { d } \propto J$ (current density)

$\left( v _ { d } \right) _ { 1 } = \left( v _ { d } \right) _ { 2 } = v$