A uniform magnetic field $\backslash ($ B$=0\mathrm{.}1500\backslash$mathrm$\{$~T$\}\backslash )$ is vertically downward

$($i$)$

$($a$)$ Find the induced current $\backslash ($ I $\backslash )$ in the resistor. A

b$)$ What horizontal force $\backslash ($ F $\backslash )$ is required to keep the axle rolling at constant speed? N

$($c$)$ Which end of the resistor, $\backslash ($ a $\backslash )$ or $\backslash ($ b $\backslash ),$ is at the higher electric potential?

Point $\backslash ($ a $\backslash )$ is at a higher potential.

point $\backslash ($ b $\backslash )$ is at a higher potential.

Point $\backslash ($ a $\backslash )$ and point $\backslash ($ b $\backslash )$ are at equal potentials.

$($d$)$ After the axle rolls past the resistor, does the current in $\backslash ($ R $\backslash )$ reverse direction?

Yes

Explain your answer

$\backslash (\backslash$square $\backslash )$