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Two rods of length d(1) and d(2) and coe...

Two rods of length `d_(1)` and `d_(2)` and coefficients of thermal conductivities `K_(1)` and `K_(2)` are kept in end to end contact with each other. The equivalent thermal conductivity is

A

`((d_(1)+d_(2))(K_(1)d_(2)+K_(2)d_(1)))/(2(K_(1)+K_(2)))`

B

`((d_(1)-d_(2))(K_(1)d_(2)+K_(2)d_(1)))/(2(K_(1)+K_(2)))`

C

`(K_(1)d_(1)+K_(2)d_(2))/(d_(1)+d_(2))`

D

`(K_(1)+K_(2))/(d_(1)+d_(2))`

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