$(20$ points$)$ An electron is moving in the $+x$ direction in a straight line at a speed of $4{10}^5\frac{m}{s}$ in a region with a uniform electric and magnetic fields. The electric field in the region is $2000\frac{V}{m}.$

$1-(5$ points$)$ The direction of the electric force is

$2-(5$ points$)$ Calculate the magnitude of the magnetic field

$B=$ T

$3-(5$ points$)$ The direction of the magnetic field is $$

$4-(5$ points$)$ If the speed is doubled while keeping the same electric and magnetic fields, the electron will