JEE Main & Advanced
Physics
Elasticity
Question Bank
Youngs Modulus and Breaking Stress
question_answer
Density of rubber is d. A thick rubber cord of length L and cross-section area A undergoes elongation under its own weight on suspending it. This elongation is proportional to
A)dL
B) Ad/L
C) \[Ad/{{L}^{2}}\]
D) \[d{{L}^{2}}\]
Correct Answer:
D
Solution :
Increment in length \[l=\frac{{{L}^{2}}dg}{2Y}\]\ \[l\propto {{L}^{2}}d\]