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Two rods A and B of different materials ...

Two rods `A` and `B` of different materials are welded together as shown in figure. Their thermal conductivities are `K_(1)` and `K_(2)`. The thermal conductivity of the composite rod will be

A

`(k_(1)+k_(2))/(2)`

B

`(3(k_(1)+k_(2)))/(2)`

C

`k_(1)+k_(2)`

D

`2(k_(1)+k_(2))`

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A
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