NEET 2024 Physics Young's Modulus and Elongation MCQ Question with Solution

The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young’s modulus, respectively, are $8 \times 10^8$ N m⁻² and $2 \times 10^{11}$ N m⁻², is :

A

40 mm

B

8 mm

C

4 mm

D

0.4 mm

Correct Answer

Option C

Detailed Explanation

Using $\Delta L = \frac{FL}{AY}$ , where F is the force at elastic limit, calculate $\Delta L = 4$ mm.

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