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JEE Main2005PhysicsThermal Properties of MatterActual

The figure shows a system of two concentric spheres of radii r₁ and r₂ and kept at temperatures T₁ and T₂ respectively. The radial rate of flow of heat in a substance between the two concentric sphere is proportional to

Options

  1. Ar₂-r₁ r₁ r₂
  2. B( r₂ r₁ )
  3. Cr₁ r₂ r₂-r₁
  4. D(r₂-r₁ )

Correct answer

C. r₁ r₂ r₂-r₁

Step-by-step solution

( dQ dt )= ( T ₁- T ₂ ) 4 r ₁ r ₂ ~K ( r ₂- r ₁ )

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