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     EduGorilla 
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    Five rods of same dimensions are arranged as shown in the fig..They have thermal conductivities, k1, k2, k5, k4, and k3, when points A and B are maintained at different temperatures. No heat flows through the central rod if : 

    Options :-

    1. k1k4= k2k3

    2. k1 = k4 and k2 = k3

    3. k1k2= k3k4

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