Force, applied to the particle:
F=qE0 Force parallel to the y-axis.
Acceleration of the particle:
a=ay=mF=mqE0 Time of passing this region with electric field:
t=ub Speed of the particle in y-direction
uy=ay⋅t=muqE0b Therefore, angle of deflection:
tanθ=uuy=mu2qE0b
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