Question

Determine the resistance of copper wire having length 1km and diameter 0.5mm​

Answer 1

$Resistivity\:(ρ)\:of\:copper = 1.7 × {10}^{-8}\:Ωm$

Now, Resistance of any metal is given by :

$R \: = ρ \times \frac{l}{a} \\ = > \:R \: = (1.7 \times {10}^{ - 8} ) \times \frac{1 \times 10^{3} m}{ {(5/10)} \times {10}^{ - 3} m} \\ = > R = (1.7 \times 10^{ - 8}) \times (2 \times{10^{6}}) \\ = > R = 3.4 \times 10^{ - 2} \: Ω \:$