A large steel plate 50 mm thick is initially at a uniform temperature of 425 degree Celsius. It is suddenly exposed on both sides to an environment with convective coefficient 285 W/m2 K and temperature 65 degree Celsius. Determine the center line temperature.For steel, thermal conductivity = 42.5 W/m K and thermal diffusivity = 0.043 m2/hr

A large steel plate 50 mm thick is initially at a uniform temperature

1.	A large steel plate 50 mm thick is initially at a uniform temperature of 425 degree Celsius. It is suddenly exposed on both sides to an environment with convective coefficient 285 W/m² K and temperature 65 degree Celsius. Determine the center line temperature. For steel, thermal conductivity = 42.5 W/m K and thermal diffusivity = 0.043 m²/hr
A.	261 degree Celsius
B.	271 degree Celsius
C.	281 degree Celsius
D.	291 degree Celsius
Answer» D. 291 degree Celsius