Question

A bimetallic strip of iron and Brass is 20mm long at a temperature of 50°C if the strip is uniformly heated to 750°C,find the difference in length between the iron and the Brass (alpha=12×10^-6 _ k-1, alpha=Brass 19×10^-6k-1

Answer 1

$$\Delta L=L_1-L_2,\\ \Delta L=\Delta T(\alpha_1-\alpha_2)=5\text{ mm}.$$