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Q.

A metal rod of length 2m has cross-sectional areas 2A and A as shown in the following figure. The two ends are maintained at temperatures100oC and 70oC. The temperature of middle point C is :
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a

80oC

b

85oC

c

95oC

d

90oC

answer is C.

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Detailed Solution

Using steady state condition qt=KA∆θl
2A(100-θ)1=A(θ-70)1
200 – 2θ = θ – 70;     270 = 3θ;     θ= 90o

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