We can set up electric field by applying a potential difference across two parallel metal plates placed horizontally separated by some distance.When an electron beam passes between the two plates ,it can be seen that the electrons are deflected toward the positive plate.The reason for this is that electrons are attracted by the positive charges and are repelled by the negative charges due to force F=qE,where 'q' is the electron charge and 'E' is the electron field due to plates.The degree of deflection of electrons from their original direction is proportional to the strength of the electric field applied.
Deflection Of Electrons By Magnetic Field:-
Now we apply magnetic field at right angle to the beam of electrons by using a horseshoe magnet.We will notice that the spot of the electrons beam on the screen is getting deflected from its original direction.Now change the direction of horseshoe magnet.We will see that spot on the fluorescent screen is getting deflected in the opposite direction.
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