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A metallic rod breaks when strain produc...

A metallic rod breaks when strain produced is `0.2%`. The Young's modulus of the material of the rod is `7xx10^(9)N//m^(2)`. What should be its area of cross-section to support a load of `10^(4)N` ?

A

`7.1xx10^(-8)m^(2)`

B

`7.1xx10^(-6)m^(2)`

C

`7.1xx10^(-4) m^(2)`

D

`7.1xx10^(-2)m^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`A=(FL)/(yl)=(10^(4)xx100)/(7xx10^(9)xx0.2)=7.1xx10^(-4)m^(2)`.
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