Question
The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are 8 10^8 ~N ~m ^ -2 and 2 10^ 11 ~N ~m ^ -2 , is:
NEET
Physics
Mechanical Properties of Solids
2024
NEET 2024
NEET Physics Question (2024) — Solution
Options
- A. 0.4 mm
- B. 40 mm
- C. 8 mm
- D. 4 mm
Answer
D. 4 mm
Step-by-step solution
In the case for maximum elongation, Stress = Elastic limit aligned _ = _ elastic L Young's modulus = 8 10^8 1 2 10^ 11 & =4 10^ -3 \\ & =4 ~mm aligned i.e. maximum elongation is 4 mm
Related: Physics — Mechanical Properties of Solids · All PYQ Banks