what force is required to stretch a still wire ,1 cm2 in cross section ,to increase its length by one percent .given Young's modulus for steel is 2*10^11 n/ m2 ?
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Length is increased by 1%
It means e/L = 1/100
Area (A) = 1 cm² = 10⁻⁴ m²
Now use Y = FL / Ae
F = YAe/L
Substitute the values. On solving we get force as 2 × 10⁵ N
It means e/L = 1/100
Area (A) = 1 cm² = 10⁻⁴ m²
Now use Y = FL / Ae
F = YAe/L
Substitute the values. On solving we get force as 2 × 10⁵ N
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Answer is in the image
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