Question:

Two wires having same length and material are stretched by same force. Their diameters are in the ratio $1 : 3$. The ratio of strain energy per unit volume for these two wires (smaller to larger diameter) when stretched is

Updated On: Sep 4, 2024
  • $3 : 1$
  • $9 : 1$
  • $27 : 1$
  • $81 : 1$
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The Correct Option is D

Solution and Explanation

Answer (d) $81 : 1$
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Concepts Used:

Hooke’s Law

Hooke’s Law states that for small deformities, the stress and strain are proportional to each other. Thus,

Stress ∝ Strain

Stress = k × Strain … where k is the Modulus of Elasticity.

When a limited amount of Force or deformation is involved then concept of Hooke’s Law is only applicable . If we consider the fact, then we can deviate from Hooke's Law. This is because of their extreme Elastic limits.