Question

Calculate the resistance of 100m long copper wire. The diameter of the wire is 1 mm. Take cu=1.7*10-8 ohm_m.

Answer 1

Answer:

Explanation:

R = ρl/A

ρ = 1.7*10⁻⁸ ohm/m

A = πr² = 22/7 * 10⁻⁶

R = 1.7*10⁻⁸*100/(3.14*10⁻⁶)

R = 1.7*10⁻⁸*10⁶*10²/3.14

R = 1.7/3.14

R ≈ 0.6Ω

∴ The resistance of 100 m long copper wire is 0.6Ω.