Question

a steel scale measures the length of a cu rod as Lcm when both are at a temperature of 20degrees centigrade.if coefficient of linear expansion of steel and cu are alfas and Aflac what would be the scale reading when both are at a temperature of 21 degrees???

Answer 1

Expansion L' = new length = L (1 +coeff x dT), where dT is change in temperature.
L is original length. Take it from there.