Physics 4B Worksheet 2b - Review Instructions . This worksheet is not to turn in, but you're encouraged to work on the problems below as a group in order to review and solidify important concepts. These questions are intended to help prepare you for the upcoming learning assessment. . Work together to solve the problem, sharing ideas and asking questions. Problems 1. Three objects each with charge Q and mass M are placed a distance L apart to form an equilateral triangle. (a) Calculate the force between any two of the objects. (b) Calculate the electric field at the center of the triangle (explain your reasoning). (c) Calculate the electric potential at the center. (d) Calculate the net electric potential energy of the system of charges. (e) If the charges are released, what will be the velocity of the objects once they have separated by several meters? (All of the potential energy will have become kinetic energy.) Q = 1100 HC M = 25 g L = 20 cm 2. A thin rod of length L has a charge Q distributed uniformly along its length. Derive an expression for the electric potential at point P, a distance x from the end of the rod. X L