Two metal rods made of steel and copper have coefficients of linear expansion $1.1 \times 10^{-5} \mathrm{~K}^{-1}$ and $1.7 \times 10^{-5} \mathrm{~K}^{-1}$ respectively. At room temperature $(300 \mathrm{~K})$, the steel rod is 4 cm longer than the copper rod. If the difference in their lengths remains same at all temperatures, then the lengths of the steel and copper rods respectively (at 300 K ) are

• Correct answer
  A

  11.33 cm and 7.33 cm
• B

  9.10 cm and 5.22 cm
• C

  15.66 cm and 11.66 cm
• D

  12.56 cm and 8.53 cm

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