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Physics · PYQ NEET UG 2024
हिन्दीThe maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are \( 8 \times 10^8 \text{ N m}^{-2} \) and \( 2 \times 10^{11} \text{ N m}^{-2} \), is :
Correct answer · Option 3
\( 4 \text{ mm} \)
Explanation
Maximum elongation occurs at the elastic limit: \( \Delta L = \frac{\text{Stress}_{\text{max}} \times L}{Y} = \frac{8 \times 10^8 \times 1}{2 \times 10^{11}} = 4 \times 10^{-3} \text{ m} = 4 \text{ mm} \).
