Answer
(b) the copper wire
Work Step by Step
The temperature coefficient of resistivity of copper is more than aluminium.
Since, rapidity of increase in resistance is directly proportional to rise in temperature, and the coefficient, the one which has more value of coefficient will higher rapid increase in resistance.
Now since the values of temperature coefficient of :-
Aluminium = $4.29\times10^{-3}/^{\circ}C$
Copper = $6.80\times10^{-3}/^{\circ}C$,
Copper wire's resistance will increase more rapidly.
