Question
A brass rod and a steel rod are both of length 1.2 m at room temperature 30°C. Both the rods are put in boiling water. Find the difference in the length of two rods in boiling water, αb = 1.8 x 10–5°C–1 and αs=l.2 x 10–5°C–1.
Solution
The length L of the rod when heated by 
°C increases to L' given by,
∴
Here lengths of the two rods are equal,
∴
The difference in length of the two rods,
°C increases to L' given by, ∴
Here lengths of the two rods are equal,
∴
The difference in length of the two rods,
