The conducting box in the figure (Figure 1) has been given an excess negative charge. The surface density of excess electrons at the center of the top surface is 2.901010 electrons/m Figure 1 of 1 1. 2. What is the electric field strength at point 1? Express your answer to three significant figures and include the appropriate units. Value Submit A Submit Value Part B What is the electric field strength E2 at point 2? Express your answer as an integer and include the appropriate units. A Units My Answers Give Up Value Units C My Answers Give Up ? Units Part C What is the electric field strength E3 at point 3? Express your answer as an integer and include the appropriate units. ? !!! ] ?