calculate the resistance of 1km long copper wire of radius 1mm

Asked by nutanpf | 27th 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 | 27th Mar, 2021, 04:53: PM