Ans. DEFLECTION OF ELECTRONS BY ELECTRIC FIELD
We can set up electric field by applying a potential difference across two parallel metal plates placed horizontally separated with some distance. When an electron beam passes between the two plates, it can be seen that the electrons are deflected towards the an electric field positive plate .The reason for this is that electrons are attracted by the positivo charges and repelled by the negative charges due to force F = qE. The degree of deflection of electrons form their original direction is proportional to the strength of the electric field applied.