NEET Physics Young's Modulus MCQ Question
A steel wire of original length 2 m and cross-sectional area 0.5 cm² is subjected to a tensile force. If the Young's modulus of steel is 2 × 10¹¹ N/m², what is the approximate extension in the wire when a 1000 N force is applied?
0.02 mm
0.2 mm
2 mm
20 mm
Correct Answer
Detailed Explanation
Using the formula ΔL = (F × L) / (A × Y), where F = 1000 N, L = 2 m, A = 0.5 × 10⁻⁴ m², and Y = 2 × 10¹¹ N/m², we calculate the extension ΔL to be approximately 0.2 mm.
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