# 3.6 A negligibly small current is passed through a wire of length 15 m and uniform cross-section , and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

Given,

Length of the wire, l = 15 m

The cross-sectional area of the wire, A =

The resistance of the wire, R = 5 Ω

We know,

, where  is the resistivity of the material

Hence, the resistivity of the material of wire is

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