Answer:
R = 8.94 10⁻² Ω/m , R_sp / R_total = 44.8
Explanation:
The resistance of a metal cable is
R = ρ L / A
The area of a circle is
A = π R²
The resistivity of copper is
ρ = 1.71 10⁻⁸ ohm / m
Let's calculate
R = 1.71 10⁻⁸ 4.27 / (π (0.51 10⁻³)²)
R = 8.94 10⁻² Ω/m
Each bugle needs two wire, phase and ground
The total wire resistance is
R_total = 2 R
R_total = 17.87 10⁻² Ω
Let's look for the relationship between the resistance of the bugle and the wire
R_sp / R_total = 8 / 17.87 10⁻²
R_sp / R_total = 44.8
