Point charge q1 = -5.00 nc is at the origin and point charge q2 = +3.00 nc is on the x-axis at x = 3.00 cm. point p is on the y-axis at y = 4.00 cm. (a) calculate the electric fields e s 1 and e s 2 at point p due to the charges q1 and q2 . express your results in terms of unit vectors (see example 21.6). (b) use the results of part (a) to obtain the resultant field at p, expressed in unit vector form.