A 1 m long metal wire of cross sectional area `10^(-6)m^(2)` is fixed at one end from a rigid support and a weight W is hanging at its other end. The graph shows the observed extension of length `Deltal` of the wire as a function of W. young’s modulus of material of the wire in SI units is :

Options

A. `5xx10^(4)`
B. `2xx10^(5)`
C. `2xx10^(11)`
D. `5xx10^(11)`

Answer

C

Explanation

`Y=(Fl)/(ADeltal)=(20xx1)/(10^(-6)xx1xx10^(-4))=20xx10^(10)=2xx10^(11)N//m^(2)`