A positively charged particle moves through a region with a uniform electric field pointing toward the top

Question:

A positively charged particle moves through a region with a uniform electric field pointing toward the top of the page and a uniform magnetic field pointing into the page. The particle can have one of the four velocities shown in FIGURE 22-55.

(a) Rank the four possibilities in order of increasing magnitude of the net force (F1, F2, F3, and F4) the particle experiences. Indicate ties where appropriate.

(b) Which of the four velocities could potentially result in zero net force?

Figure 22-55