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Q.

A wire is connected to a battery and drift velocity of electrons in the conductor is v0 . If wire is stretched to quadruple its length and connected to same battery, the new drift velocity is

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a

v04

b

v02

c

2v0

d

4v0

answer is A.

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Detailed Solution

i=neAvd =VR=VAρl vd= Vρlne  her v is constant  l becomes 4l so vd becomes  vd/4
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