I need the second part's answer only:))

Course Contents > Review Assignment 2 : Electric potential ... > Two Systems of Charges Timer Notes Evaluate Feedback Print Info Figure 1 Figure 2 +q L -9 b +9 +9 d +q Consider two separate systems, each with four charges of magnitude q arranged in a square of length L as shown above. Points a and c are in the center of their squares while points b and d are half way between the lower two charges. Select True or False for the following statements. The electric potential at c is zero. The electric field at d is zero. The electric field at b is zero. The electric potential at a is zero. The electric field at c is zero. The electric field at a is zero. The electric potential at d is zero. The electric potential at b is zero. Submit Answer Tries 0/15 Using the diagram above, find the magnitude of the electric field at point d. DATA: q= 0.750 MC, L= 0.40 m. Submit Answer Tries 0/15 Post Discussion Send Feedback Podcasts 20