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jee_main_2025_07_april_evening - Thermal Properties of Matter Topics

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QUESTION #23 Thermal Conduction
Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratio of lengths, radii and thermal conductivities of these rods are: fracmathrmL_mathrmAmathrmL_mathrmB = frac12, fracmathrmr_mathrmAmathrmr_mathrmB = 2 and fracmathrmK_mathrmAmathrmK_mathrmB = frac12 . The free ends of rods A and B are maintained at 400mathrm~K, 200mathrm~K, respectively. The temperature of rods interface is ________ K, when equilibrium is established. [cite: 187, 188, 189, 190, 191, 192, 193]
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