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A heat source at \( T=10^{3} \mathrm{~K} \) is connected to another heat reservoir at \( T=10^{2} \mathrm{~K} \) by a copper slab which is \( 1 \mathrm{~m} \) thick.
\( \mathrm{P} \) Given that the thermal conductivity of copper is \( 0.1 \mathrm{WK}^{-1} \mathrm{~m}^{-1} \), the energy flux through it in the steady state is
W
[JEE (Main) 2019]
(a) \( 200 \mathrm{Wm}^{-2} \)
(b) \( 90 \mathrm{Wm}^{-2} \)
(c) \( 65 \mathrm{Wm}^{-2} \)
(d) \( 120 \mathrm{Wm}^{-2} \)
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