On applying a stress of `xN//m^(2)`, the length of wire of some material gets doubled. Value of Young's modulus for the material of the wire in `N//m^(2)`, is (assume Hooke's law to be valid and go for approx. results)

Options

A. `x`
B. `2x`
C. `x/2`
D. Insufficient information

Answer

A

Explanation

`Y="Stress"/"Strain" =x/((2l-l)/l)=x/l=x`
Actually the above expesing is not exact for this much elongation.