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Question 30877
JEE Physics · Hard

Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Conduction MCQ

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ConductionHardQuestion 30877

Question

Thermal resistance of a rod is analogous to electrical resistance. For a rod of conductivity k, area A, length L, thermal resistance is:
  1. A
    kA/L
  2. B
    L/(kA)
    Correct
  3. C
    kL/A
  4. D
    A/(kL)

Correct answer

L/(kA)

Explanation

By analogy: thermal resistance R_th = L/(kA), just as electrical R = ρL/A (with ρ = 1/σ_elect, k = thermal conductivity).

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