Question

At 25°C, the resistance of a given wire of length 1m and diameter 0.5 mm is 25 ohm. What is the resistivity of the material of the wire at that temperature?

Answer 1

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Radius of the cross section of the wire(r) = 0.02 mm. = 0.002 cm. ∴ ρ = 2.62 × 10⁻⁶ Ω-cm. Hence, the Specific Resistance of the Resistivity of the wire is 2.62 × 10⁻⁶ Ω-cm.

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Answer 2

Answer:

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