How Is Charge Mass Ratio Calculated?

How Is Charge Mass Ratio Calculated? The electron charge-to-mass ratio was measured by accelerating the electrons through a voltage Vx towards a positively charged plate. … The force on an electron due to the electric field is →Felec=−|e|Eyˆy and the force on an electron due to the magnetic field is →Fmagn=|e|vxBˆy. How do you calculate