A very thin $15\mathrm{.}0$ cmcm copper bar is aligned horizontally along the east$-$west direction.

Part A

If it moves horizontally from south to north at $10\mathrm{.}5$ m$/$sm$/$s in a vertically upward magnetic field of $1\mathrm{.}28$ TT $,$ what potential difference is induced across its ends?

Express your answer in volts.

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VabVab $=$

nothing

VV

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Part B

If it moves horizontally from south to north at $10\mathrm{.}5$ m$/$sm$/$s in a vertically upward magnetic field of $1\mathrm{.}28$ TT $,$ which end $($east or west$)$ is at a higher potential $?$

eastwest

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Part C

What would be the potential difference if the bar moved from east to west instead?

Express your answer in volts.