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The elastic limit of stees is 8xx10^8Nm^...

The elastic limit of stees is `8xx10^8Nm^-2` andits Young modulus `2xx10^11Nm^-2`. Find the maximum eleongatin of a half metre steel wire that can be given without exceeding the elastic limit.

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The correct Answer is:
B
Elastic unit `=8xx10^5N/m^2`
`Y=2xx10^11N/m^2`
`L-1/2m=0.5m`
`Y=F/A L/(/_\L)`
`rarr /_\L=(FL)/(AY)`
`rarr /_\L=(8xx10^5xx)0.5)0/(2xx10^11)`
`=2xx10^-3m=2cm`
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