An electron moves at speed $8\mathrm{.}0$ times $10\mathrm{⁶}$ ?m$/$s toward the velocity selector shown in $($Figure $\mathrm{}),$ ?where the electric field is hidden from view. A $0\mathrm{.}12$ ?T magnetic field points into the paper.

A$)$ ?Determine the magnitude of the magnetic force that the magnetic field exerts on the electron.

B$)$ ?Determine the direction of the magnetic force that the magnetic field exerts on the electron? $($Upward or downward$)$

C$)$ What E$?$ ?field magnitude is required so that the electric force exerted on the electron is equal in magnitude and opposite in direction to the magnetic force?

D$)$ ?What E$?$ ?field direction is required so that the electric force exerted on the electron is equal in magnitude and opposite in direction to the magnetic force? $($upwards or downwards$)$

X A y x