A current i flows in a wire of circular cross-section with the free electrons travelling with a drift velocity v. The drift velocity of electron when a current 2 i flows in another wire of twice the radius and of the same material is
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a
V /2
b
V
c
2 V
d
2⋅v
answer is A.
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Detailed Solution
The drift velocity is given byVd=ineA=VAgain vd′=2ine(4A)=12ineA=V2