-160 -160 300 TA 140 -60 140In a grid of wires, the temperature at exterior mesh points is maintained at constant values as shown in the figure. When the grid is in thermal equilibrium, the temperature at each interior mesh point is the average of the temperatures at the four adjacent points. For instance, T2 + 73+ 0-160 T1 = Find the temperatures 71, 72, T3, T4, when the grid is in thermal equilibrium. T1 = T2 = T3 = TA =