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NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

Which of the following cylindrical rods will conduct maximum heat, when their ends are maintained at the same temperature difference?

Options

  1. Al = 1 m , r = 0.2 m
  2. Bl = 1 m , r = 0.1 m
  3. Cl = 10 m , r = 0.1 m
  4. Dl = 0.1 m , r = 0.3 m

Correct answer

D. l = 0.1 m , r = 0.3 m

Step-by-step solution

Δ Q Δ t = K A Δ T Δ x = K π r 2 ∆ T l ∝ r 2 l As r 2 l is maximum for (d), so it is the correct choice.

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