Question

Calculate the resistance of 1 km long copper wire of radius 1 mm. Resistivity of the
copper wire is 1.72 x 10 -8 Ωm.

Answer 1

Answer:

Step-by-step explanation:

Answer 2

So the calculation part starts,

Length=1 km=1000m

Radius=1 mm=1*10⁻³ m

Resistivity of copper=1.72x10⁻⁸

Resistance=(Resistivity of copper * Length)/(Area)

                 =(Resistivity of copper * Length)/(r²)

Resistance=[1.72*10⁻⁸*1000]/[22/7*(1*10⁻³)²

Resistance=5.5 ohm