Two identical rods AC and CB made of two different metals having thermal conductivities in the ratio 2 : 3 are kept in contact with each other at the end C.as shown in the Fig. A is at 100°C and B is at 25°C. Then the junction C is at :

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55°C

60°C

75°C

50°C

answer is A.

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Detailed Solution

dQdt=(2K)A(100-θ)l=(3K)A(θ-25)l⇒θ=55oC.

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