Four rods of identical dimensions (cross sectional area A and length L ) arranged as shown in the figure. The thermal conductivity of each rod is indicated in the figure. Temperature at junction B is $____$ $^{\circ} C$ .

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TestHub · Accepted Answer

3( 100 − T ​ ) = T ​ + ( T ​ − T B ​ ) 300 = 5 T ​ − T B ​ …… ( 1 ) T ​ − T B ​ = T B ​ − 48 T ​ = 2 T B ​ − 48 …… ( 2 ) 300 = 5 ( 2 T B ​ − 48 ) − T B ​ ⇒ 9 T B ​ = 540 ⇒ T B ​ = 6 0 ​

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