A wire of cross-section area `A`, length `L_(1)`, resistivity `rho_(1)` and temperature coefficient of resistivity `alpha_(1)` is connected in series to a second wire of length `L_(2)`, resistivity `rho_(2)` temperature coefficient of resistivity `alpha_(2)` and the same area `A`, so that wires carry same current. Total resistance `R` is independent of temperature for small temperature change if (Thermal expansion effect is negligible)