Speed of a transverse wave on a straight wire (mass $6.0 \mathrm{g},$ length $60 \mathrm{c}\mathrm{m}$ and area of cross-section $1.0 \mathrm{m}{\mathrm{m}}^2$  is $90 {\mathrm{m} \mathrm{s}}^{-1}$. If the Young's modulus of wire is $16\times {10}^{11} \mathrm{N} {\mathrm{m}}^{-2}$, the extension of wire over its natural length is:

• Correct answer
  A

  $0.03 \mathrm{m}\mathrm{m}$
• B

  $0.02 \mathrm{m}\mathrm{m}$
• C

  $0.04 \mathrm{m}\mathrm{m}$
• D

  $0.01 \mathrm{m}\mathrm{m}$

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