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A heat source at T = 103 K is connected to another heat reservoir at T = 102 K by a copper slab which is 1 m thick. Given that the thermal conductivity of copper is 0.1 WK–1 m–1, the energy flux through it in the steady state is : 

(1) 120 Wm–2 

(2) 65 Wm–2 

(3) 200 Wm–2 

(4) 90 Wm–2

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Correct option: (4) 90 Wm–2


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