Question

The length of steel rod is \(5 \text{ cm}\) longer than the copper rod at all temperatures. The length of the steel and copper rod is respectively (\(\alpha_s = 1.1 \times 10^{-5}/^{\circ} \text{C}, \alpha_c = 1.7 \times 10^{-5}/^{\circ} \text{C}\))

• A. nearly 15 cm and 10 cm
• B. nearly 14 cm and 9 cm
• C. nearly 12 cm and 7 cm
• D. nearly 13 cm and 8 cm

Hint:

For the difference in length to remain independent of temperature, the rod with the smaller expansion coefficient must be longer.

Answer 1

The Correct Option is B