At the temperature 0C the electric resistance of conductor 2 is times that of conductor 1. Their

Question:

At the temperature 0°C the electric resistance of conductor 2 is η times that of conductor 1. Their temperature coefficients of resistance are equal to a2 and a1 respectively. Find the temperature coefficient of resistance of a circuit segment consisting of these two conductors when they are connected
(a) In series;
(b) In parallel.