Answer 1

Given: R₁ = 4.2 Ω, R₂ = 5.4 Ω, T₁ = 27° C, T₂ = 100° C

To find: Temperature coefficient of resistance (α)

Formula: α = `("R"_2-"R"_1)/("R"_1("T"_2-"T"_1))`

Calculation: From the formula,

α = `(5.4-4.2)/(4.2(100-27))` = 3.91 × 10⁻³/° C

The temperature coefficient of resistance is 3.91 × 10⁻³/° C.