Q6. A steel wire of length \( 2.0 \, \text{m} \) and cross-sectional area \( 3 \times 10^{-6} \, \text{m}^2 \) is stretched by \( 0.4 \, \text{mm} \). If the Young's modulus of steel is \( 2 \times 10^{11} \, \text{N/m}^2 \), what is the force applied?
- A. \( 100 \, \text{N} \)
- B. \( 150 \, \text{N} \)
- C. \( 120 \, \text{N} \)
- D. \( 130 \, \text{N} \)