Highly selective Backlog Qs for JEE MainPhysicsMechanical Properties of Solids
A 100 ~m long wire having cross-sectional area 6.25 10⁻⁴ ~m ^2 and Young's modulus is 10¹⁰ Nm ⁻² is subjected to a load of 250 ~N , then the elongation in the wire will be :
Options
- A6.25 10⁻³ ~m
- B4 10⁻⁴ ~m
- C6.25 10⁻⁶ ~m
- D4 10⁻³ ~m
Correct answer
D. 4 10⁻³ ~m
Step-by-step solution
= F Y A = 250 100 10¹⁰ 6.25 10⁻⁴ =40 10⁻⁴ ~m =4 10⁻³ ~m