A uniform electric field E is created between two parallel
., charged plates as shown in figure . An electron
. enters the field symmetrically between the plataes with a
. speed `v_0. The length of each plate is l. Find the angle of
. deviation of the path of the electron as it comes out
. of the field.

Explanation

The situation is shown in figure. Here we know in X-direction speed of electron remains uniform In X direction
`u_X=u`
In Y direction `V_("y initial")=0`
Acceleration in y-direction of electron is

`a=(eE)/(m)`
`V_(Y _("fifnal "))=u_(Y_("intial"))+at `

`V_(y)=((eE)/m)(l/u)`
`tantheta=(V_(y))/(V_(x))=(eEl)/("mu")//u`
`theta=tan ^(-1)((eEl)/("mu"^(2)))`