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JEE Main202224 Jun 2022Morning ShiftPhysicsThermal Properties of MatterActual

Two metallic blocks M 1 and M 2 of same area of cross-section are connected to each other (as shown in figure). If the thermal conductivity of M 2 is K then the thermal conductivity of M 1 will be : [Assume steady state heat conduction]

Options

  1. A10 K
  2. B8 K
  3. C12 . 5 K
  4. D2 K

Correct answer

B. 8 K

Step-by-step solution

Let thermal conductivity of M 1 be K ' . Using heat current relation for steady state conduction, K ' A 100 - 80 16 = K A 80 - 0 8 ⇒ K ' × 20 16 = K × 80 8 ⇒ K ' = 8 K

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