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Two rods Aand B of different material ar...

Two rods Aand B of different material are welded together as shown in figure . Their thermal conductivity of the composite rod will be:

A

`(3(k_1+k_2))/2`

B

`k_1+k_2`

C

`2(k_1+k_2)`

D

`((k_1+k_2))/2`

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