STANDARDPhysics-Thermal Properties of Matter
STANDARD Physics Thermal Conductivity MCQ Question
Type: MCQ-conceptual-Medium-Class 11
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 will be
A
3(K₁ + K₂)/2
B
K₁ + K₂
C
2(K₁ + K₂)
D
(K₁ + K₂)/2
Correct Answer
Option D
Detailed Explanation
Equivalent thermal conductivity of the composite rod in parallel combination will be K = (K₁A₁ + K₂A₂) / (A₁ + A₂) = (K₁ + K₂) / 2.
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