A nichrome wire long and in diameter has a resistance of

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

Problem

A nichrome wire 50 cm50\,\text{cm} long and 0.50 mm0.50\,\text{mm} in diameter has a resistance of 2.0 Ω2.0\,\Omega. Calculate the resistivity of nichrome. (a) 3.1×10−6 Ω m3.1\times 10^{-6}\,\Omega\,\text{m} (b) 7.9×10−6 Ω m7.9\times 10^{-6}\,\Omega\,\text{m} (c) 7.9×10−7 Ω m7.9\times 10^{-7}\,\Omega\,\text{m} (d) 7.9×10−8 Ω m7.9\times 10^{-8}\,\Omega\,\text{m}

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