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JEE Main2004PhysicsThermal Properties of MatterActual

The temperature of two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2 K and thickness x and 4 x , respectively are T₂ and T₁ (T₂>T₁ ) . The rate of heat transfer through the slab, in a steady state is ( A (T₂-T₁ ) K x ) f , with f equal to

Options

  1. A1
  2. B1 / 2
  3. C2 / 3
  4. D1 / 3

Correct answer

D. 1 / 3

Step-by-step solution

q = kA x [ T ₂- 2 ~T ₂- T ₁ 3 ]= kA 3 x [ T ₂- T ₁ ]

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