One end of a thermally insulated rod is kept at a temperature `T_1` and the other at
Channel: Doubtnut
Date: 2020-07-12

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