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  4. Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities K 1, K 2, K 3, K 4 and K 5. When points A and B are maintained at different temperatures, no heat flows through the central rod if

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Q. Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities $K _1, K _2, K _3$, $K _4$ and $K _5$. When points $A$ and $B$ are maintained at different temperatures, no heat flows through the central rod ifPhysics Question Image

Thermal Properties of Matter

Solution:

Correct answer is (b) $K _1 K _4= K _2 K _3$