Practice question

Given: A steel wire of length 2.0 m and cross-sectional area 2.5 × 10⁻⁶m² is stretched by a force of 250 N . If the Young's modulus of steel is 2 × 10¹¹N/m², what is the strain produced? These values define the system as per NCERT data. Formula: Stress: Stress = F/A = frac2502.5 × 10⁻⁶= 1 × 10⁸N/m². This is standard NCERT relation. Substitution & Calculation: Young's modulus: Y = fracStressStrain . Strain: Strain = fracStressY = frac1 × 10⁸² × 10¹¹= 5 × 10⁻⁴. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.