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Calculate the resistivity of a material of a wire 10 m long. 0.4 mm in diameter and having a resistance of 2.0 Ω.

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Here l = 10 cm, r = 0.2 mm = 0.2 x 10-3 m, R = 2 Ω

[r = \(\frac{d}{2}\)]

= 2.513 x 10-8

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