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Q.

Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0°C and 90°C respectively. The temperature of the junction of the three rods will be

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a

45°C

b

60°C

c

30°C

d

20°C

answer is B.

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Detailed Solution

Q1t+Q2t=QtkA(90−θ)L+kA(90−θ)L=kA(θ−0)L=180−2θ=θ⇒θ=60∘
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