Two identical rods made of two different metals A and B with thermal conductivities K A and K B respectively are joined end to end. The free end of A is kept at a temperature T 1 while the free end of B is kept at a temperature T 2 (< T 1 ). Therefore, in the steady state
A
the temperature of the junction will be determined only by K A and K B
B
if the lengths of the rods are doubled the rate of heat flow will be halved.
C
if the temperature at the two free ends are interchanged the junction temperature will change
D
the composite rod has an equivalent thermal conductivity of 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(b, c, d)
⇒ (T 1 – T j ) k A = (T 2 – T j )k B
So T j depends on k A , k B & T 1 , T 2
⇒ k eq = 
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