A composite block is made of slabs A, B, C, D and E of diff…

Physics Transmission of Heat JEE (Advanced) / IIT-JEE Problems (Previous Years) MCQ (Single Correct)

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

heat flow through A and E slabs are same

heat flow through slab E is maximum

temperature difference across slab E is smallest

heat flow through C = heat flow through B + heat flow through D.

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a, c, d)

: At steady state, heat flow through A and E are same.

: T = i × R

‘i’ is same for A and E but R is smallest for E.

: i B =

i C =

i D =

if i c = i B + i D

Hence

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