A 100 m long wire having cross-sectional area 6 . 25 × 10 - 4 m 2 and Young's modulus is 10 10 N m - 2 is subjected to a load of 250 N , then the elongation in the wire will be :

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As we know, elongation in wire is given by, ∆ l = F l AY ⇒ ∆ l = 250 × 100 6 . 25 × 10 - 4 × 10 10 ⇒ ∆ l = 4 × 10 - 3 m

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