What will be the change in interatomic distance (in $\stackrel{°}{\mathrm{A}}$) of steel on applying a stress of ${\text{10}}^9{\text{ N/m}}^{\text{2}}$. The Young's modulus of steel is $2\times {10}^{11} \text{N}/{\text{m}}^2$ and the interatomic distance in steel is $2.8 \stackrel{°}{\mathrm{A}}$. 

 

 

• A

  $7\times {10}^{-3}$
• Correct answer
  B

  $14\times {10}^{-3}$
• C

  $21\times {10}^{-3}$
• D

  $28\times {10}^{-3}$

Hence, the correct answer is option: 'B'.