JAMB Physics 2021 Objective — Question 6
Question 6 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2021 Objective paper, with the correct answer and a full explanation.
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Load 20 N on wire (area 8×10⁻⁷ m², extension 10⁻⁴ m, length 3 m). Young's modulus:
- A. 9×10¹¹ Nm⁻²
- B. 8.5×10¹¹ Nm⁻²
- C. 7.5×10¹¹ Nm⁻²Correct
- D. 7×10¹¹ Nm⁻²
Explanation
Y=Fl/Ae=(20×3)/(8×10⁻⁷×10⁻⁴)=7.5×10¹¹ Nm⁻².
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