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R = 4 Ω
L = 5 m
A = 0,35 mm² = 35 x 10^-8 m²
ρ = ...?
R = ρ L / A
maka ρ = R A / L
ρ = 4 Ω. 35 x 10^-8 m² / 5 m
ρ = 4 . 7 x 10^-8 Ωm
ρ = 28 x 10^-8 Ωm
ρ = 2,8 x 10^-7 Ωm
Jadi, hambatan jenis kawat itu 2,8 x 10^-7 Ωm