The adjacent graph shows the extension ($∆I$) of a wire of length 1m suspended from the top of a roof at one end with a load W connected to the other end. If the cross sectional area of the wire is ${10}^{-6}{\mathrm{m}}^2$, calculate the young's modulus of the material of the wire

 

• A

  $2\times {10}^{11}\mathrm{N}/{\mathrm{m}}^2$

• B

  $2\times {10}^{-11} \mathrm{N}/{\mathrm{m}}^2$

• C

  $2\times {10}^{-12}\mathrm{N}/{\mathrm{m}}^2$

• D

  $2\times {10}^{-13}\mathrm{N}/{\mathrm{m}}^2$