Civil Engineering MCQAE Level Civil Engineering
A steel wire of 2 mm diameter, 10 m long (E = 200 GPa) carries 2.5 kN. Extension is approximately:
Strength of MaterialsWire ExtensionMEDIUM
Choose the correct answer
A
10 mm
B
20 mm
C
40 mm
D
80 mm
Correct Answer
C. 40 mm
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A = π×4/4 = 3.14 mm²; δ = PL/(AE) = 2500×10,000/(3.14×200,000) = 39.8 ≈ 40 mm
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