Two rods A and B of different materials ...

Two rods A and B of different materials are welded together shown in figure. Their thermal conductivities are `K_1` and `K_2`. The thermal conductivity of the composite rod will be:

`(K_1 + K_2)/2`

`3(K_1 + K_2)/2`

`(K_1 + K_2)`

`2(K_1 + K_2)`

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