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Lakhmir Singh & Manjit Kaur - Physics

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Q. 3 B3.7( 34 Votes )

Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7×10^-8 Ω m.

Class 10th Lakhmir Singh & Manjit Kaur - Physics 1. Electricity

Answer :

According to Question,
Length of Wire= 1km=1000m

Diameter of Wire=0.50mm
∴ Radius of wire= 0.25mm=0.25x10^-3m

Resistivity(ρ)=1.7x10^-8Ωm

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