Determine the resistance, in milliOhms, of a metal rod 3.99 m long, 0.39cm diameter and composed of aluminum of resistivity 2.8 x 10-8 Ωm .

Respuesta :

In order to solve this, we need the formula for resistance

R = ρL/A

R = (2.8 x 10-8 Ωm)(3.99 m) / π(0.39 * 10^-2)^2 = 0.00233 ohms = 2.33 milliohms