The path of a positively charged particle 1 through a rectangular region of uniform electric field is as shown in the figure. What is the direction of electric field and the direction of deflection of particles 2,3 and 4 ?

Concept Used: Electric field 

Detailed Solution:

A positive charge experiences a force in the direction of Electric field , negative charge experiences force in direction opposite to Electric field 

Since, positively charged particle 1 is diverted towards top

$\Rightarrow$The direction of Electric field is towards top 

Now, particle 2 is negatively charged Hence it will experience a force in downward direction.

$\Rightarrow$ Particle $3\to$ Positive $\therefore$force is directed upwards

$\Rightarrow$Particle 4$\to$negative $\therefore$ force is directed downwards