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Question 30875
JEE Physics · Hard

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

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ConductionHardQuestion 30875

Question

A cylindrical rod connects hot (200°C) and cold (0°C) reservoirs. If length is doubled keeping cross section same, heat flow rate:
  1. A
    Doubles
  2. B
    Halves
    Correct
  3. C
    Stays same
  4. D
    Quadruples

Correct answer

Halves

Explanation

Q/t = kAΔT/L. If L doubles, Q/t halves.

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