What length of copper wire 1.6 mm in diameter is needed to make a 18 ohm resistor at 18 degrees C.
i am taking resistivity of copper in this question ρ = 1.724 x 10-8
if you have different data , then let me know
R = ρ L /A
A = pi*r^2 = pi* ( 1.6*10^-3 /2)^2 =2.0106193e-6 m2
R = ρ L /A
18 = 1.724 x 10-8 *L /(2.0106193e-6)
from here L≈2099.25 m
so length we need L ≈2099.25 m
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