A long rod is used to increase the heat transfer rate from a surface maintained at 500°C. The Cross section of the rod is (10 × 20) mm2 and the surrounding is maintained at 27°C. Find the value of heat transfer coefficient (W/m2k) if the temperature at 400 mm from the surface should not exceed 50°C. Take conductivity of rod 205 W/mk (up to 2 decimal place)