A rigid bar of weight W=3000 N hangs from three equally spaced wires, two of steel and one of aluminium as shown in the figure below. The diameter of the wires is 4 mm. Before they were loaded, all three wires had the same length. If the entire load is to be carried by the steel wires, then the 201 temperature increase AT (inC) in all the three wires will be (Assume E= 210 GPa, s = 6.510^-6/C and a = 1210^-6/)