A positively charged particle moves through a region with a uniform electric field pointing into the page and a uniform magnetic field pointing toward the top of the page. The particle can have one of the four velocities shown in the figure .
A) Rank the four possibilities in order of decreasing magnitude of the net force (F1, F2, F3, and F4) the particle experiences.
Rank forces from largest to smallest.
B) Which of the four velocities could potentially result in zero net force?
The Attempt at a Solution
WELL, in the equation F=qvBsin(theta), q, V, and B are negligible. Therefore, all the magnitude depends on in this case is the angle. Since the force is 0 if the velocity is parallel to the magnetic field, I thought V2 and V4 would be 0 and V1 and V3 would be a larger magnitude. This isn't the right answer though. Once I figure out part A, I should be able to do Part B. Where in my thinking was my logic flawed?