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R = 2 ohm
L = 2 m
A = 0,35mm² = 0,35x10⁻⁶ m
ditanyakn : ρ ?
dijawab :
R = ρ L/A
2 = ρ 2/0,35x10⁻⁶
ρ x 2 = 2 x 0,35x10⁻⁶
ρ = (2 x 0,35x10⁻⁶)/2
ρ = 0,35x10⁻⁶ ohm/m³
jadi massa jenis = 0,35x10⁻⁶ ohm/m³