R = resistivity × l /A
here R = 1.5 ohm
resistivity = 1.5×10^(-6)
A = πr^2 = 3×(0.5×10^(-3))^2
so
length l = 1.5×0.75×10^(-6)/(1.5×10^(-6))
or length l = 0.75 m
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