A metallic wire long has a resistance of

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A metallic wire 2 m2\,\text{m} long has a resistance of 2 Ω2\,\Omega. If its diameter is 1 mm1\,\text{mm}, the resistivity of the material is closest to (a) 2.0×10−7 Ω m2.0\times10^{-7}\,\Omega\,\text{m} (b) 7.9×10−7 Ω m7.9\times10^{-7}\,\Omega\,\text{m} (c) 3.1×10−6 Ω m3.1\times10^{-6}\,\Omega\,\text{m} (d) 6.3×10−7 Ω m6.3\times10^{-7}\,\Omega\,\text{m}

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