Properties Of Solids And Liquids Question 448

Question: A partition wall has two layers of different materials A and B in contact with each other. They have the same thickness but the thermal conductivity of layer A is twice that of layer B. At steady state the temperature difference across the layer B is 50 K, then the corresponding difference across the layer A is

Options:

A) 50 K

B) 12.5 K

C) 25 K

D) 60 K

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Let T be temperature of the junction Here, KA=2KB,

TTB=50K At the steady state, HA=HB

KAA(TAT)L=KBA(TBT)L

2KB(TAT)=KB(TTB)

TAT=TTB2=50K2=25K



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