A beam of electron is that through a small hole into vacuum between two parallel plates wich are separated by a distance D=2.5 cm. A voltage V= 500 volts is applied across the plate, with the far one being positive.
A) what is the electric field intensity ( magnitude and direction) inside the plates?
B) if th inital speed of the electrons is Vs=1.5X10^8 m/s, what will be the speed when they reach the far plate?