A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductivity.
Electrical conductivity = the reciprocal of resistivity
but resistivity(ρ) = \(\frac{R\times A}{L}\)
resistivity(ρ) = \(\frac{ 2.0 \times 10^{-3} \times0.1}{100}\) = 0.000002
electrical conductivity(σ) = \(\frac{1}{ρ}\)
σ = \(\frac{1}{0.000002} = 500000ω^{-1}cm^{-1}\)
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