A brass wire of length 2 m and radius 1 mm at 27^° C is held taut between two rigid supports. Initially it was cooled to a temperature of -43 °C…

A brass wire of length $\displaystyle 2$ m and radius $\displaystyle 1$ mm at $\displaystyle 27^{\circ} \mathrm{C}$ is held taut between two rigid supports. Initially it was cooled to a temperature of -$\displaystyle 43$ °C creating a tension $\displaystyle T$ in the wire. The temperature to which the wire has to be cooled in order to increase the tension in it to $\displaystyle 1.4 T$, is $\displaystyle \_\_\_\_$ °C.