NEET Physics Elastic Behavior MCQ Question
A steel wire of length 2 m and cross-sectional area 1 mm² is subjected to a tensile load, resulting in an elongation of 0.5 mm. If the Young's modulus of steel is 2 x 10¹¹ N/m², calculate the tensile load applied to the wire.
100 N
200 N
50 N
500 N
Correct Answer
Detailed Explanation
Using the formula stress = strain × Young’s modulus, and stress = F/A, we find F = (strain × Young’s modulus) × A. The strain is 0.5 mm / 2 m = 0.00025, thus F = 0.00025 × 2 x 10¹¹ × 1 x 10⁻⁶ m² = 100 N.
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