A particular of mass m and charge $(-q)$ enters the region between the two charged plates initially moving along x-axis with speed $V_x $ (like particle 1 in the figure) . The length of plate of L and a uniform electricity field E is maintained between the plates. she that the vertical deflection of the particle at the fan edge of the plate is 4qEl^2/2mv_x ^2$. Compare this motion with motion of a projectile in gravitational field.

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