We usually go over stuff after getting the assignments, so I have no clue how to start this question. Figure 23N-14 shows the deflection-plate system of a conventional TV tube. The length of the plates is 3.2 cm and the electric field between the two plates is 10^6 N/C (vertically up). If the electron enters the plates with a horizontal velocity of 3.8*10^7 m/s, what is the vertical deflection y at the end of the plates? I think F=-1.6E10 but have no clue where the direction of the electric field plays in.