Given,
Temperature of heat source, TH=103K,
Temperature of heat reservoir, TL=102K,
Conductivity of copper K=0.1WK−1m−1
From the equation of steady-state heat flow,
dtdQ=LKAΔT
Heat energy flux can be defined as the rate of heat energy transfer through a given surface.
A1(dtdQ)=K×11000−100=90Wm−2