Question

Two metal rods A and have their initial length in the ratio 2:3 and coefficients of linear expansion in the ratio of 4:3. When they are heated through same temperature difference the ratio of their linear expansion is

Answer 1

L2 = L1 ( 1 + @T)

L2 - L1 = L1 @T

Ratio of linear expansion = ( L1 @1)/ L2@2

= 2× 4)/ 3× 3

= 8/9