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Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 month ago

What is the resistance of a 5.00km long copper wire that has a diameter of 0.500cm?

resistivity of copper: 1.68x10^-8 ohm meters

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  • 1 month ago
    Favourite answer

    radius = 0.25 cm = 0.0025 m

    area = πr² = 0.00001964 m²

    R = (1.68e-8)(5000)/(0.00001964) = 4.28 Ω

    Resistance of a wire in Ω

    R = ρL/A

    ρ is resistivity of the material in Ω-m

    L is length in meters

    A is cross-sectional area in m²

    A = πr², r is radius of wire in m

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