Answer
Since the electron has a negative charge, the electric force acting on it is directed opposite to the electric field, which points in the $-x$ direction. As a result, the electron accelerates constantly in the $-x$ direction. While initially moving in the $+x$ direction, the electron slows down, eventually reverses direction, and then moves in the $-x$ direction with increasing speed.
Work Step by Step
reading on electron forces in 16.5. No specific eqs.
