Two different rods A and B are kept as shown in figure.The variation of temperature of different cross sections is plotted in a graph shown in figure.The ratio of thermal conductivities of B to A is __________.

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answer is 2.

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Detailed Solution

∵ΔQΔtA=ΔQΔtB∴KAA(100−70)30=KBA(70−35)70⇒KA=KB2⇒KBKA=2

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