First slide

Drift velocity

Question

A wire is connected to a battery and drift velocity of electrons in the conductor is ${v_{0}}_{}$ . If wire is stretched to quadruple its length and connected to same battery, the new drift velocity is

Moderate

A

$\frac{v_{0}}{4}$
B

$\frac{v_{0}}{2}$
C

$2 v_{0}$
D

$4 v_{0}$

Solution

$i = n e A v_{d} = \frac{V}{R} = \frac{V A}{ρ l} v_{d} = \frac{V}{ρ \ln e} h e r v i s c o n s \tan t l b e c o m e s 4 l s o v_{d} b e c o m e s v_{d} / 4$

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