Problem#$2.$ A positive charge moves with a velocity

through a region where both a uniform magnetic field and uniform electric field exists. $($a$)$

Calculate the total force on the moving charge $($in unit vector notation$),$ taking

and $[4$pts$]($b$)$ What angle does the force vector

make with the positive x$-$axis? $[4$pts$]$

q$=3\mathrm{.}2$x$10-19$ C $!$

v$=(2$i $+3$j $-$k$)$ m$/$s

$!$

B$=(2$i $+4$j $+$k$)$ T $!$

E$=(4$i $-$j $-2$k$)$ V$/$m$.$