Two perfectly black parallel plates $1\mathrm{.}2$ m by $1\mathrm{.}2$ m are separated by a

distance of $1\mathrm{.}2$ m$.$ One plate is maintained at $800$ K and the other at $500$ K$.$ The plates are located in a large room whose walls are at $300$ K$.$

What is the net heat transfer between the plates $?$

Stefan$-$Boltzmann constant a $=5\mathrm{.}669$ x $10-8$ W$/$m$2.$K$4$

F$12($view factor$)=0\mathrm{.}2$