Problem 1 Three electric point charges are placed at the origin, (4d, 0) and (0, 3d) y respectively. Here d is constant of length. The first charge is placed at the origin carrying a charge -Qo. One finds that the electric field at point P with coordinate (4d, 3d) is zero. Q2-7 #3 + P (a) Find the charge Q2 located at (4d, 0). 3d (b) Find the charge Q3 located at (0, 3d). #1 #2 + 4d Q2 =