Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be
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a
3K1+K22
b
K1+K2
c
2K1+K2
d
K1+K22
answer is D.
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Detailed Solution
Equivalent thermal conductivity of the composite rod in parallel combination will be,K=K1A1+K2A2A1+A2=K1+K22
Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be