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a mild steel wire of length 2l ,cross sectionala rea A is fixed horizontally between 2 pillars .a small mass m kg is suspended from mid point of wire .if extension in wire is within elastic limit,depression at mid point is 1.(mg/YA)^{1/3} 2.(mg/lA)^{1/3} 3.(mgl3/yA)^{1/3} 4.mg/2AY

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