In an electric field, like the one above, the horizontal velocity remains constant as the force is perpendicular to it.
Lets say we remove this electric field and add a magnetic field acting perpendicularly into the plane of the diagram, and then send the election through from left to right.
Using Flemming's left hand rule, and taking into account the flow of conventional current would oppose that of the electron, I'd think the electron would accelerate upwards.
In my textbook it says it would continue to accelerate upwards, following a similar path to Figure 4 - flipped vertically.
But, this seems counter-intuitive to me, as the force is relative and perpendicular to the current, which itself is proportional to its motion.
Wouldn't this result in a circular path?