Question

Gauge no. 36 copper wire has a diameter of 0.058m. Find the length of no. 36 copper wire which will give a resistance of 0.0005 ohms

Answer 1

$R=\rho l/A$

$A=\pi d^2/4=3.14\cdot0.058^2/4=0.00264\ (m^2)$

$l=R\cdot A/\rho=0.0005\cdot 0.00264/1.75\cdot10^{-8}=75.45\ (m)$ . Answer