Topic: Heat, temperature and thermal expansion· Properties of Solids and Liquids
Coefficient of linear expansion of brass and steel rods are α_1 and α_2. Lengths of brass and steel rods are l_1 and l_2 respectively. If (l_2 - l_1) is maintained same at all temperatures, which one of the following relations holds good ?
1. \(\alpha_1 l_2 = \alpha_2 l_1\)
2. \(\alpha_1 l_2^2 = \alpha_2 l_1^2\)
3. \(\alpha_1^2 l_2 = \alpha_2^2 l_1\)
4. \(\alpha_1 l_1 = \alpha_2 l_2\)