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A load of 1 kg weight is attached to one of a steel wire of area of cross- section $3\; mm ^2$ and young's modulus $10^{11}\;Nm^2$. The other end is suspended vertically from a book on a wall, then the load is pulled horizontally and released. When the load passes through its lowest position the fractional change in length is $(g= 10 m/sec^2)$

\[\begin {array} {1 1} (1)\;10^{-4} & \quad (2)\;10^{-3} \\ (3)\;10^3 & \quad (4)\;10^4 \end {array}\]
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$(1) 10^{-4}$
answered Nov 7, 2013 by pady_1

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