Question $3$: The system shown in the figure is heated to $100$c when it is in the shown position. At the end of heating, in which direction and how much does tip A move relative to the zero point? $($Thermal expansion of the Steel $=12\mathrm{.}10^-61/$c $,$ and for the Copper $=17\mathrm{.}10^-61/$c$)$Seldil $5\mathrm{.}63$