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A uniform rod of mass m, length l , area of crosssection A has Young’s modulus Y.

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A uniform rod of mass m, length l , area of crosssection A has Young’s modulus Y. If it is hanged vertically, elongation under its own weight will be

(a) mgl / 2AY

(b) 2mgl / AY

(c) mgl / AY

(d) mgY / Al

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Correct option: (c) mgl / AY

Explanation:

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