Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratios of lengths, radii and thermal conductivities of these rods are: L A /L B =1/2, r A /r B =2 and K A /K B =1/2. The free ends of rods A and B are maintained at 400 K, 200 K, respectively. The temperature of rods interface is _ _ _ K, when equilibrium is established.

Thermodynamics: JEE Main 2025 Physics question

JEE Main 2025 · 7 Apr, Evening shift · Q48

JEE Main 20257 Apr, Evening shiftPhysicsHardThermodynamics163× since 2002

Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratios of lengths, radii and thermal conductivities of these rods are:

\frac{L_A}{L_B}=\frac12

\frac{r_A}{r_B}=2

and

\frac{K_A}{K_B}=\frac12

. The free ends of rods A and B are maintained at 400 K, 200 K, respectively. The temperature of rods interface is ______ K, when equilibrium is established.

Your answerType your answer. Integers and decimals are accepted.

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