calculate the visistivity of a cr-wire of length 18m & cross sectional area 9 mm². A current of 36 a passed through it when connected to a supply of petential 66 V
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A copper wire of cross - sectional area 2.0mm^2 , resistivity = 1.7 × 10^-8Ω m , carries a current of 1 A. The electric field in the copper wire is:
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from given data A = 2mm^2 ρ = 1.7 × 10^-8Ω m. i = 1 A V = iR ( from ohms law.) V = i × ρlA E.l = i × ρlA E = i × ρlA = 1A × 1.7 × 10^-8Ωm2mm^2
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