Information is give on first line (question 4 - information) & the question is on the 3rd line (question 4 part b)

Question 4 - Information Two positive charges with a charge of 9 x 10 9 C each are lined up as is shown in the diagram. Assume all distances are in meters. O (0, 4) Question 4 - Part A (0, 0) Question 4 - Part B Calculate the magnitude and direction of the net electric field at (0, -4)