NEET Physics Stress & Strain MCQ Question
A steel wire of original length 2 m is subjected to a tensile force, resulting in an extension of 1 mm. If the Young's modulus of steel is 2 x 10^11 N/m², what is the stress experienced by the wire?
1 x 10^8 Pa
1 x 10^7 Pa
2 x 10^6 Pa
5 x 10^9 Pa
Correct Answer
Detailed Explanation
Stress is calculated using the formula: Stress = Young's modulus x Strain. Strain is the change in length divided by the original length (1 mm / 2 m = 0.0005). Thus, Stress = 2 x 10^11 N/m² x 0.0005 = 1 x 10^8 Pa.
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