A solid cylindrical wire is long and has a radius of

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

A solid cylindrical wire is 0.80 m0.80\,\text{m} long and has a radius of 0.50 mm0.50\,\text{mm}. Its measured resistance is 0.040 Ω0.040\,\Omega. Determine the resistivity of the material of the wire. (a) 3.9×10−6 Ω m3.9\times10^{-6}\,\Omega\,\text{m} (b) 1.0×10−8 Ω m1.0\times10^{-8}\,\Omega\,\text{m} (c) 3.9×10−8 Ω m3.9\times10^{-8}\,\Omega\,\text{m} (d) 3.9×10−7 Ω m3.9\times10^{-7}\,\Omega\,\text{m}

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