A steel plate of thickness 5 cmm and thermal conductivity 20 W/mK is subjected to a uniform heat flux of 800 W/m2 on one surface A and transfers heat by convection with a heat transfer coefficient of 80 W/M2k from the other surface B into the ambinet air at T¥ of 250C. the temperature of the surface B transferring heat by convection is (IES-99)
(a) 250C (b) 350C
(c)450C (d) 550c