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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 conductivites `K_(1)` and `K_(2)` are kept touching each other. Both have the same area of cross-section. The equivalent thermal conductivity.

A

`K_1d_1+K_2d_2`

B

`K_1+K_2`

C

`(K_1d_1+K_2d_2)/(d_1+d_2)`

D

`(d_1+d_2)/((d_1/K_1+d_2/K_2))`

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