Three equal masses of $3 \,kg$ are connected by massless string of cross sectional area $0.005$ $cm^{2}$ and Young?? modulus $2\times10^{11} N /m^{2}$. In the absence of friction, the longitudinal strain in the wire
- $A$ is $10^{-4}$
- $B$ is $2\times10^{-4}$
- Both (a) and (b)
- None of these
The Correct Option is C
Solution and Explanation
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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.