Transmission Of Heat Question 85
Question: A metal rod of length 2m has cross sectional areas 2A and A as shown in figure. The ends are maintained at temperatures 100°C and 70°C. The temperature at middle point C is
[CPMT 2000]
Options:
A) 80°C
B) 85°C
C) 90°C
D) 95°C
Show Answer
Answer:
Correct Answer: C
Solution:
Let q be temperature middle point C and in series rate of heat flow is same
Therefore $ K(2A)(100-\theta )=KA(\theta -70) $
Therefore $ 200-2\theta =\theta -70 $
Therefore $ 3\theta =270 $
Therefore $ \theta =90{}^\circ C $
BETA
