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A load of 1 kg weight is a attached to o...

A load of 1 kg weight is a attached to one end of a steel wire of area of cros-section `3 mm^(2)` and Young's modulus `10^11 Nm^-2`. The other end is suspended vertically from a hook 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 `(10ms^-2)`

A

`0.3xx10^-4`

B

`0.3xx10^-3`

C

`0.3xx10^3`

D

`0.3xx10^4`

Text Solution

Verified by Experts

The correct Answer is:
A
Young's Modulus ,`E=(mgl)/(Adeltal)`
`therefore (Deltal)/l =(mg)/(AE) =(1xx10)/(3xx10^(-6)xx10^(11)) =0.3XX10^(-4)`
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