Three point charges lie along a straight line, where q1= 6.00µC, q2 = 1.50µC, and q3 = -2.00µC. The separation distances are d1 = 3.00 cm and d2 = 2.00 cm. Calculate the magnitude and direction of the net electric force on (a) q1, (b) q2, and (c) q3. D1 lies between q1 and q2.