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JEE Main 2022 (24 Jun, Shift 1) · Heat Conduction

Heat Conduction question from JEE Main 2022 (24 Jun, Shift 1)

Q27JEE Main 2022 · 24 JUN · SHIFT 1Medium

Heat Conduction

Two metallic blocks M1 and M2 of same area of cross-section are connected to each other (as shown in figure). If the thermal conductivity of M2 is K then the thermal conductivity of M1 will be: [Assume steady state heat conduction]

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Answer: (b)

Same heat current through both blocks: $\frac{K_1A(100-80)}{16} = \frac{KA(80-0)}{8}$
$\frac{20K_1}{16} = 10K$
$K_1 = 8K$ , so the answer is (b).

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