A beam of electrons moving with velocity of 107m/s, enters midway between two horizontal parallel plates in the direction parall
el to the plates which are 5cm long and 2cm apart and have a p.d. of 90 V between them. Calculate the velocity of the electron-beam with which it just grazes the edge of the plate. Assume=1.76 x 10¹¹ C/kg help me please
