Three identical point charges each of charge q are located at the vertices of an equilateral triangle as in the figure shown below. The distance from the center of the triangle to each vertex is a. (a) Show that the electric field at the center of the triangle is zero. (Submit a file with a maximum size of 1 MB.) Choose File No file chosen This answer has not been graded yet. (b) Find a symbolic expression for the electric potential at the center of the triangle. (Use any variable or symbol stated above along with the following as necessary: k. for the Coulomb's constant.) (c) Give a physical explanation of the fact that the electric potential is not zero, yet the electric field is zero at the center. This answer has not been graded yet