Question

What is electrically resistivity of a material of conductor ?calculate the resistance of a conductor of 2km long copper wire of area of cross section 4MM^2.resistivity of copper=1.72*10^-8 ohm metre

Answer 1

Explanation:

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Resistivity(p), can be defined as the resistance offered by an area per unit length .

We know that :

R = pL/A

R = 1.72*10^-8 [2000/4*(1/1000)²]

R = 1.72 × 0.5 × 10

R = 5 × 1.72

R = 8.6