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Two bar of identical dimensions are kept as shown in figure. If `K_1` and `K_2`are their coefficients of thermal conductivities, then equivalent K

A

`(K_1K_2)`/`(K_1+K_2)`

B

`2(K_1K_2)`/`(K_1+K_2)`

C

`(K_1+K_2)`/2

D

`(K_1+K_2)`

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