Electrostatics and Electric Fields (4C) Practice Test

A charged particle moves through a region with a uniform electric field but no magnetic field. The field is constant in time. Based on the setup, which outcome is most likely for the particle’s kinetic energy as it moves in the direction of the electric force (ignore collisions)?

A charged lipid vesicle ($q=+4.0\times10^{-15}\ \text{C}$) is placed in a uniform electric field directed downward (−y). Gravity is negligible compared with electric effects. Based on the setup, which outcome is most likely for the direction of the electric force on the vesicle?