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Thermal Properties — Easy JEE physics MCQ

A metal rod of length $1$ m at $20°C$ has coefficient of linear expansion $2 \times 10^{-5}$ /°C. Its length at $70°C$ is:
  1. A. $1.001$ m
  2. B. $1.002$ m
  3. C. $1.0001$ m
  4. D. $1.01$ m

Solution

$\Delta L = L\alpha\Delta T = 1 \times 2 \times 10^{-5} \times 50 = 10^{-3}$ m $L' = 1 + 0.001 = 1.001$ m

PHYSICS

easy • PYQ Reworded
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A metal rod of length 11 m at 20°C20°C has coefficient of linear expansion 2×10−52 \times 10^{-5} /°C. Its length at 70°C70°C is:
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Thermal Properties — Easy JEE Physics MCQ | MyGoalPrep