Question
Coefficient of linear expansion of brass and steel rods are 
and 
. Lengths of brass and steel rods are l1 and l2 respectively. If (I2 - I1) is maintained same at all temperatures, which one of the following relations holds good?
Solution
C.
Coefficient of linear expansion of brass = 
Coefficient of linear expansion = 
Length of brass and steel rods are l1 and l2 respectively.
Given,
Increase in length (l2'-l1' ) is same for all temperature.
So,
l2'-l1' = l2 - l1
