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Q.

A composite rod ABC is made of two rods AB and BC of same cross-sectional area. Material of AB has coefficient of thermal conductivity K and that of rod BC is k2 . In steady state , temperature of junction B is

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a

75oC

b

66.7oC

c

90oC

d

87.5oC

answer is C.

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Detailed Solution

100−θl/KA=θ−502lkA/2⇒100−θ=θ−504                             ⇒θ=90oC
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