Four charges are situated as shown in the diagram (each grid line is separated by 1 meter). The two upper charges have a charge of -3 pC (-3x10 C). The two lower charges have a charge of +3 pC (+3x10 C). 13) What is the magnitude of the net electric field at the point (0, 0)? a) ON/C b) 3,375 N/C c) 4773 N/C d) 9546 N/C e) 13,500 N/C eifieT 14) What is the net electric potential at the point (0, 0)? a) -38,184 V b) -9545V c) 0V d) 9545 V e) 38,184 V 15) What is the magnitude of the net force on the upper right charge? a) 0.0036 N b) 0.0046 N c) 0.0056 N d) 0.0066 N e) 0.0076 N 16) What is the net work needed to bring in all four charges from infinity to build this configuration? a) -0.029 ] b) -0.037J c) -0.055 1] d) -0.069 J e) -0.0721]