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A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10

Area of cross-section of the wire, A =π (d/2) 2. Diameter= 0.5 mm = 0.0005 m. Resistance, R = 10 Ω We know that. radius of wire r = 0.5/2 mm = 0.25 mm ...

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