Question on: JAMB Physics - 2024
The stress experienced by a wire of diameter y/π m loaded by a weight y² N is
A
π N/m²
B
2π N/m²
C
4π N/m²
D
8π N/m²
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Correct Option: C
1. Stress formula: Stress = Force / Area
2. Area of the wire (circular cross-section): Area = π r²
3. Radius: r = diameter / 2 = y / (2 π) m
4. Area: Area = π * (y / 2π)² = y² / 4π m²
5. Stress: Stress = Force / Area = y² / (y² / 4π) = 4π N/m²
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