The force required to stretch a steel wire of area of cross-section $1 \mathrm{~mm}^2$ to double its length is (Young's modulus of steel $=2 \times 10^{11} \mathrm{~N} \mathrm{~m}^{-2}$ )

• A

  $2 \times 10^3 \mathrm{~N}$
• Correct answer
  B

  $2 \times 10^5 \mathrm{~N}$
• C

  $2 \times 10^2 \mathrm{~N}$
• D

  $2 \times 10^4 \mathrm{~N}$

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