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A heat source at T = 10 3 K is connected to another heat reservoir at T = 10 2 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. 200 Wm –2
2. 65 Wm –2
3. 120 Wm –2
4. 90 Wm –2

Correct answer: 90 Wm –2

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