The graphic below illustrates the path of a positively charged particle as it is fired between two plates of unknown charge: Which of the following is the most likely orientation of the plates?

In the graphic below, a positive test charge is placed at Point P in the electric field shown: Which of the following is the best description of the net force on the charge once it is released?

During a lab experiment, two identical conducting spheres where charged using a rubber rod and a piece of fur. They were hung from strings as shown in this diagram. Students collected the following data from the experiment. Based on the information above, how much electrostatic force occurred between the spheres in the experiment?