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MHT CET20226 Aug 2022Morning ShiftPhysicsThermal Properties of MatterActual

The ratio of thermal conductivity of two rods A and B with the same area of cross-section is 3: 2 . If the thermal resistance of two rods is the same, then the ratio of length of rod A to length of rod B is

Options

  1. A3: 2
  2. B2: 3
  3. C5: 1
  4. D1: 5

Correct answer

A. 3: 2

Step-by-step solution

Given A₁=A₂ and K₁ K₂ = 3 2 If thermal resistance is equal R₁=R₂ l₁ K₁ A₁ = l₂ K₂ A₂ l₁ l₂ = K₁ K₂ = 3 2

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