Calculate the resistance of 100m long copper wire. The diameter of the wire is 1 mm. Take cu=1.7*10-8 ohm_m.
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Explanation:
R = ρl/A
ρ = 1.7*10⁻⁸ ohm/m
A = πr² = 22/7 * 10⁻⁶
R = 1.7*10⁻⁸*100/(3.14*10⁻⁶)
R = 1.7*10⁻⁸*10⁶*10²/3.14
R = 1.7/3.14
R ≈ 0.6Ω
∴ The resistance of 100 m long copper wire is 0.6Ω.
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