A platinum wire has a resistance of at and at

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

Problem

A platinum wire has a resistance of 5.00 Ω5.00\,\Omega at 20 ∘C20\,^{\circ}\text{C} and 6.20 Ω6.20\,\Omega at 80 ∘C80\,^{\circ}\text{C}. Assuming the temperature coefficient of resistivity remains constant, calculate its value α\alpha at 20 ∘C20\,^{\circ}\text{C}. (a) 3.2×10−3 ∘C−13.2\times10^{-3}\,^{\circ}\text{C}^{-1} (b) 6.0×10−3 ∘C−16.0\times10^{-3}\,^{\circ}\text{C}^{-1} (c) 4.0×10−3 ∘C−14.0\times10^{-3}\,^{\circ}\text{C}^{-1} (d) 3.0×10−3 ∘C−13.0\times10^{-3}\,^{\circ}\text{C}^{-1}

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