A very thin $23\mathrm{.}0$ cmcm copper bar is aligned horizontally along the east$-$west direction. If it moves horizontally from south to north at $13\mathrm{.}5$ m$/$sm$/$s in a vertically upward magnetic field of $1\mathrm{.}18$ TT $,$ what potential difference is induced across its ends?If it moves horizontally from south to north at $13\mathrm{.}5$ m$/$sm$/$s in a vertically upward magnetic field of $1\mathrm{.}18$ TT $,$ which end $($east or west$)$ is at a higher potential $?$What would be the potential difference if the bar moved from east to west instead?