Physics help

Three point charges are arranged as shown. You don't know how big the boxes are. B. -Inc C. A. D E. +3 nC - 12 nC Which arrow best represents the direction of the electric field vector at the location of the dot (pay attention to the magnitudes and placements of the charges)? OA OB OC O m O 4.5 x 10 5 Z O 2.25 x 10 5 N O 14.6 x 10 5 N O In-7 What is the numerical value of the electric potential at the location of the dot? -3724 V +4832 V +1225 V -2365 V How much electric potential energy would a -1 nC charge have if placed at the location of the dot? 2.37 micro-Joules O 4.82 micro-Joules 17.3 milli-Joules