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r₁ = 0,01 cm
R₁ = 2 Ω
L₂ = 50 m
r₂ = 0,02 cm
R₂ = ?
R₂ / R₁ = (L₂ / L₁) * (r₁ / r₂)²
R₂ / 2 = (50/100) * (0,01 / 0,02)²
R₂ = ¹/₄ = 0,25 Ω