The resistance of 1km long copper wire is 3.44ꭥ. Calculate its area of cross section? (Given resistivity of the copper is 1.72×10⁻⁸ꭥm)
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The resistance of 1km long copper wire is 3.44ꭥ. Calculate its area of cross section? (Given resistivity of the copper is 1.72×10⁻⁸ꭥm)
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Answer: So the calculation part starts,
Length=1 km=1000m
Radius=1 mm=1*10⁻³ m
Resistivity of copper=1.72x10⁻⁸
Resistance=(Resistivity of copper * Length)/(Area)
=(Resistivity of copper * Length)/(r²)
Resistance=[1.72*10⁻⁸*1000]/[22/7*(1*10⁻³)²
Resistance=5.5 ohm