The heating spiral of an electric fire is removed from its silicon tube, uncoiled, and measured. It has a length of 4 m, a diameter of 0.2 mm, and its resistance is measured as 20 Ω. What is the resistivity, in μΩmm, of the spiral material?

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.