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hambatan = 20 Ω,
Luas Penampang 2,5mm² = 2,5 x 10^-6 m²
Ditanya : Berapa hambatan Jenis kawat tsb (ρ)
ρ = A.R/L
= 2,5 x 10^-6 m² . 20 Ω / 2 m
= 25 x 10^-6 Ωm
= 2,5 x 10^-5 Ωm