Two point charges, Q1 = -7.9 μC and Q2 = 2.2 μC ,are located between two oppositely charged parallel plates, as shown in (Figure 1) . The two charges are separated by a distance of x = 0.44 m . Assume that the electric field produced by the charged plates is uniform and equal to E = 55000 N/C . Neglect the charge redistribution in plates. 

Calculate the magnitude of the net electrostatic force on Q1.
Express your answer to two significant figures and include the appropriate units.