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Mechanical Properties of Solids: Elastic PE MCQ

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Elastic PEMediumQuestion 6357

Question

Elastic PE stored in wire (Y=2×10¹¹ Pa, V=1 cm³, strain=10⁻³):
  1. A
    100 J
  2. B
    0.1 J
    Correct
  3. C
    10 J
  4. D
    0.01 J

Correct answer

0.1 J

Explanation

u = ½Yε² = ½×2×10¹¹×10⁻⁶ = 10⁵ J/m³. PE = u×V = 10⁵×10⁻⁶ = 0.1 J.

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