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Three rods A,B and C have the same dimensions. Their thermal conductivities are kA, ks and kerespectively. A and B are placed end to end, with their free ends kept at a certain temperaturedifference C isplaced separately, with its ends kept at the same temperature difference. The twoarrangement conduct heat at the same rate. kc must be equal to(A) k +kek+kc)a+(D)2K2

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