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One end of a thermally insulated rod is ...

One end of a thermally insulated rod is kept at a temperature `T_1` and the other at `T_2`. The rod is composed of two sections of length `l_1 and l_2` and thermal conductivities `K_1 and K_2` respectively. The temperature at the interface of the two section is

A

`(K_2 l_2 T_1+K_1 l_1 T_2 )//(K_1 l_1 +K_2 l_2)`

B

`(K_2 l_1 T_1+K_1 l_2 T_2)//(K_2 l_1 +K_1 l_2 )`

C

`(K_1 l_2 T_1+K_2 l_1 T_2)//(K_1 l_2 +K_2 l_1)`

D

`(K_1 l_1 T_1+K_2 l_2 T_2)//(K_1 l_1+K_2 l_2)`

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