calculate the resistance of 1km long copper wire of radius 1mm. Restivity of copper 1.7×10(-8) ohm
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We have,
Length=1km= 1000m
Radius=1 mm = 0.001m
So, area of cross section (A) of wire= pi×r^2
=3.14× 0.001×0.001=3.14× 10^-6
Now, since resistance = (resistivity ×length) / area of cross section
= (1.7×10^-8× 1000) /3.14× 10^-6
=0.541×10= 5.4 (approx)
Hope this helps
Length=1km= 1000m
Radius=1 mm = 0.001m
So, area of cross section (A) of wire= pi×r^2
=3.14× 0.001×0.001=3.14× 10^-6
Now, since resistance = (resistivity ×length) / area of cross section
= (1.7×10^-8× 1000) /3.14× 10^-6
=0.541×10= 5.4 (approx)
Hope this helps
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