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A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K  and sizes (given in terms of length, L) as shown in the figure. All slabs are of same width. Heat ‘Q’ flows only from left to right through the blocks. Then in steady state
  • a)
    heat flow through A and E slabs are same.
  • b)
    heat flow through slab E is maximum
  • c)
    temperature difference across slab E is smallest.
  • d)
    heat flow through C = heat flow through B + heat flow through D.
Correct answer is option 'A,C,D'. Can you explain this answer?
Verified Answer
A composite block is made of slabs A, B, C, D and E of different therm...
It is given that heat Q flows only from left to right through the blocks. Therefore heat flow through A and E slabs are the same.
∴ [a] is correct option
Since heat flow through slabs A and E is same, [b] is not correct.
We know that resistance to heat flow is R =l/KA
Let the width of slabs be Z. Then
Now,ΔT = QR
As RE is least, ΔTE is also smallest ie since the resistance to heat flow is least for slab E, the temperature difference across is smallest.
∴  Option (c) is the correct answer.
Also
∴ (d) is the correct option.
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A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K and sizes (given in terms of length, L) as shown in the figure. All slabs are of same width. Heat ‘Q’ flows only from left to right through the blocks. Then in steady statea)heat flow through A and E slabs are same.b)heat flow through slab E is maximumc)temperature difference across slab E is smallest.d)heat flow through C = heat flow through B + heat flow through D.Correct answer is option 'A,C,D'. Can you explain this answer?
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A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K and sizes (given in terms of length, L) as shown in the figure. All slabs are of same width. Heat ‘Q’ flows only from left to right through the blocks. Then in steady statea)heat flow through A and E slabs are same.b)heat flow through slab E is maximumc)temperature difference across slab E is smallest.d)heat flow through C = heat flow through B + heat flow through D.Correct answer is option 'A,C,D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K and sizes (given in terms of length, L) as shown in the figure. All slabs are of same width. Heat ‘Q’ flows only from left to right through the blocks. Then in steady statea)heat flow through A and E slabs are same.b)heat flow through slab E is maximumc)temperature difference across slab E is smallest.d)heat flow through C = heat flow through B + heat flow through D.Correct answer is option 'A,C,D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K and sizes (given in terms of length, L) as shown in the figure. All slabs are of same width. Heat ‘Q’ flows only from left to right through the blocks. Then in steady statea)heat flow through A and E slabs are same.b)heat flow through slab E is maximumc)temperature difference across slab E is smallest.d)heat flow through C = heat flow through B + heat flow through D.Correct answer is option 'A,C,D'. Can you explain this answer?.
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