Question

A copper rod of $88 cm$ and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: ($\alpha_{cu}-1.7\times 10^{-5}K^{-1}$and $\alpha_{Al}=2.2×10^{-5}K^{-1}$)

• A. 6.8 cm
• B. 113.9 cm
• C. 88 cm
• D. 68 cm

Answer 1

Answer: (D)

68 cm

Answer 2

The correct option is (D) :68 cm