I anticipate that the electron will form an ellipse shape. Basically I would like to know how to calculate the major and minor axis of the ellipse.

I know how to calculate the electrostatic deflection of an electron beam, and I know how to calculate the magnetic deflection of an electron beam. I am guessing you got to combine these two ideas, but I cant figure out how. Hopefully there are some more intelligent people in here than me.

I thank you in advance

Jon