A test charge starts at rest and is attracted to a fixed negative charge distribution that has a small tunnel that allows the test charge to pass through as shown in the animation (position is in charge radii and time is in seconds).
If the charge is uniform, which of the animations correctly depicts the motion of the test charge?
Animation 3.
See Giancoli-PA: Appendix D, Giancoli-SE: 22-3.
Physlet problem authored by Mario Belloni.