answer with explanation

3. Two point charges q1 = 7 HC and q2 = -2 HC, 40 cm apart, are located between two oppositely charged parallel plates, as illustrated. Assuming that the electric field produced by the plates, E = 60 000 N/C, is uniform, determine the magnitude and direction of the net electrostatic force on q1 . [3] 91 92 O 40 cm