ICSE Class 10 Answered
calculate the resistance of 1km long copper wire of radius 1mm
Asked by nutanpf | 27 Mar, 2021, 04:41: PM
Expert Answer
Resistance R = ρ × (L/A)
where ρ= 1.7 × 10-8 Ω-m is resistivity of copper, L is length of wire and A is area of cross section .
R = ( 1.7 × 10-8 × 1000 ) / ( π × 10-6 ) = 5.411 Ω
Answered by Thiyagarajan K | 27 Mar, 2021, 04:53: PM
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