A 12-cm × 18-cm circuit board houses on its surface 100 closely spaced logic chips, each dissipating 0.06 W in an environment at 40°C. The heat transfer from the back surface of the board is negligible. If the heat transfer coefficient on the surface of the board is 10 W/m²·K, determine

(a) The heat flux on the surface of the circuit board, in W/m²;

(b) The surface temperature of the chips;

(c) The thermal resistance between the surface of the circuit board and the cooling medium, in °C/W.