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MHT CET202411 May 2024Evening ShiftPhysicsThermal Properties of MatterActual

A metal rod having coefficient of linear expansion 2 10⁻⁵ / ^ C is 0.75 m long at 45^ C . When the temperature rises to 65^ C , the increase in length of the rod will be

Options

  1. A3.0 mm
  2. B0.75 mm
  3. C0.30 mm
  4. D0.15 mm

Correct answer

C. 0.30 mm

Step-by-step solution

aligned & = d l l dt d l & = l dt & =2 10⁻⁵ 0.75 (65^ -45^ ) & =0.3 10⁻³ ~m =0.30 ~mm aligned

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