Solving a problem in physics section 71 point 37 electr

Solving a problem in physics section 71 point 37 electr

37. The electron flew into a flat capacitor, being at the same distance from each plate and having a velocity υ = 1 · 107 m / s, parallel to the plates. The distance between the plates is d = 2 cm, the length of each plate is l = 2 cm. What is the smallest potential difference to be applied to the plates so that the electron does not fly out of the capacitor?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)