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Question 6

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 x 10-7 m2, and its resistance is measured to be 5.0 Ω. What is the resistivity of the material at the temperature of the experiment?

Answer

Length of the wire, l =15 m

Area of cross-section of the wire, a = 6.0 × 10 - 7 m2

Resistance of the material of the wire, R = 5.0 Ω

Resistivity of the material of the wire = ÃÂ

Resistance is related with the resistivity as

Therefore, the resistivity of the material is 2 × 10 - 7 Ω

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