Physics

Physics

Problem

A thin rectangular film resistor is 2.0 cm2.0\,\text{cm} long, 5.0 mm5.0\,\text{mm} wide, and 0.10 mm0.10\,\text{mm} thick. Its measured resistance at room temperature is 2.4 Ω2.4\,\Omega. Using the data below, which material is MOST consistent with the measurement? Material-Resistivity (Ω⋅m\Omega\cdot\text{m} at 20 ∘C20\,^\circ\text{C}) A. Aluminum 2.82×10−8 Ω⋅m2.82\times10^{-8}\,\Omega\cdot\text{m} B. Tungsten 5.6×10−8 Ω⋅m5.6\times10^{-8}\,\Omega\cdot\text{m} C. Manganin 4.4×10−7 Ω⋅m4.4\times10^{-7}\,\Omega\cdot\text{m} D. Graphite 3.5×10−5 Ω⋅m3.5\times10^{-5}\,\Omega\cdot\text{m} a) Manganin, 4.4×10−7 Ω⋅m4.4\times10^{-7}\,\Omega\cdot\text{m} b) Graphite, 3.5×10−5 Ω⋅m3.5\times10^{-5}\,\Omega\cdot\text{m} c) Aluminum, 2.82×10−8 Ω⋅m2.82\times10^{-8}\,\Omega\cdot\text{m} d) Tungsten, 5.6×10−8 Ω⋅m5.6\times10^{-8}\,\Omega\cdot\text{m}

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