Question

A partition wall has two layers A and B, in contact, each made of a different material. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. If the steady state temperature difference across the wall is 60 K, then the corresponding difference across the layer A is (a) 10 K (b) 20 K (c) 30 K (d) 40 K

Answer 1

Answer:

From fouriers law of conduction

Heat transfer will be same for both walls in contact

so Q

1

=Q

2

so

l

2KAΔT

a

=

l

KAΔT

b

ʕ ꈍᴥꈍʔ

here thickness is same and cross sectional area is also same so will get cancelled

∴2T

a

=T

b

and given that T

b

=50

so T

a

=25K