What length of copper wire of specific resistance 1.7

Asked by admin @ 17/08/2021 in Physics viewed by 298 People

What length of copper wire of specific resistance 1.7×10^-8 ohm/m and radius 1 mm is required so that its resistance is 1 ohm ?

Answered by admin @ 17/08/2021

As
resistance(R)= specific resistance(α)*length(l)/ Area(A)
therefore, l = R*A/α
i.e. l = 1*3.14*10^-6/1.7*10^-8
l ~ 184 metre

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