Physics

Physics

Problem

A cylindrical wire of length 0.500 m0.500\,\text{m} and diameter 0.80 mm0.80\,\text{mm} has a measured resistance of 0.013 Ω0.013\,\Omega at 20 ∘C20\,^\circ\text{C}. Based on the resistivities shown below, which material is the wire MOST likely made of? Material-Resistivity (Ω⋅m\Omega\cdot\text{m} at 20 ∘C20\,^\circ\text{C}) A. Copper 1.68×10−81.68\times10^{-8} B. Aluminum 2.82×10−82.82\times10^{-8} C. Constantan 4.90×10−74.90\times10^{-7} D. Nichrome 1.10×10−61.10\times10^{-6} a) Nichrome, 1.10×10−6 Ω⋅m1.10\times10^{-6}\,\Omega\cdot\text{m} b) Aluminum, 2.82×10−8 Ω⋅m2.82\times10^{-8}\,\Omega\cdot\text{m} c) Copper, 1.68×10−8 Ω⋅m1.68\times10^{-8}\,\Omega\cdot\text{m} d) Constantan, 4.90×10−7 Ω⋅m4.90\times10^{-7}\,\Omega\cdot\text{m}

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