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D1 = 2.D2
R = ρl/A
karena ρ dan l sama, maka:
R1/R2 = A2 / A1
R/R2 = (D2)² / (D1)²
R/R2 = (D2)² / (2.D2)²
R/R2 = D2² /4.D2²
R/R2 = 1/4
R2 = 4R
jadi hambatan ke2 = 4 kali hambatan pertama.