JAMB Physics 2025 Objective — Question 13
Question 13 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A steel wire 2 m long, cross-section 1.0 mm², Young's modulus 2×10¹¹ Nm⁻². Extension under 200 N load:
- A. 0.5 mm
- B. 2 mmCorrect
- C. 10 mm
- D. 20 mm
Explanation
e=FL/AY=(200×2)/(10⁻⁶×2×10¹¹)=2 mm.
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