P_01: Suppose that q = −2.0 nC. Q-01: What is the contribution to the electric potential (at the location of the dot) from the charge, q? V Q-02: What is the total electric potential at the location of the dot? V Q-03: What is the potential energy of a proton located at the dot? Note: This is not the total potential energy of the collection of charges. x10−16 J