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