A particle of mass m and charge (-q) enters the region between the two charged plates initially moving along x-axis with speed
vx (like particle 1 in Fig.). The length of plate is L and an uniform electric field E is maintained between the plates. Show that the deflection in
y direction of the particle at the far edge of the plate is
qEL2/(2mv2x).
Compare this motion with motion of a projectile in gravitational field.