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ICSE Class 9 Answered

determine the resistance of a copper wire having a length of 1 km and diameter of 0.5 mm  
Asked by mintosingh935 | 23 Jul, 2019, 08:50: PM
answered-by-expert Expert Answer
Let ρ is resistivity of copper (ρ =1.72×10-8 Ω-m) , l is length and A is area of crosssection

Resistance of copper wire = ρ×l/A  = 1.72×10-8 ×1000×4/(π×0.5×0.5×10-6) ≈ 87.6 Ω
Answered by Thiyagarajan K | 23 Jul, 2019, 10:59: PM

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