Problem 4 (10 points): Point charge (11 = - 5.00 nC is at the origin and point charge q1 = + 3.00 nC is on the xaxis at x = 3.00 cm. Point P is on the yaxis at y = 4.00 cm (a) Calculate the electric elds E1 and 32 at point P due to the charges ql and 4312. Express your results in terms of unit vectors (see example 21.6). (b) Use the results of part (a) to obtain the resultant eld at P, expressed in unit vector form