Two thin metal strips, one of brass and the other of iron are fastended together parallel to each other. Thickness of each strip is `2 mm`. If the strips are of equal length at `0^(@)C`. The radius of the are formed by the bimetaalic strip when heated to `80^(@)C` is (Coefficient of linear expansion of brass`=19xx10^(-6)//^(@)C &`
of iron=`12xx10^(-6)//^(@)C)`.