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A stress of 3.18 xx 10^(8) Nm^(-2) is ap...

A stress of `3.18 xx 10^(8) Nm^(-2)` is applied to a steel rod of length 1m along its length, its Young's modulus is `2 xx 10^(11) Nm^(-2)`. Then the elongation produced in the rod (in mm) is

A

3.18

B

6.36

C

5.18

D

1.59

Text Solution

Verified by Experts

The correct Answer is:
D
Strees `= 3.18 xx 10^(8) N//m^(2), l= 1m`
`Y= 2 xx 10^(11) N//m^(2)`
`Delta l= (Fl)/(AY)= (3.18 xx 10^(8) xx 1)/(2 xx 10^(11))= 1.59` mm
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