Two point charges, Q1 = 3. 2 μC and Q2 = -1. 9 μC ,are placed on the x axis. Suppose that Q2 is placed at the origin, and Q1 is placed at the coordinate x1 = − 6. 0 cm (Figure 1). At what point(s) along the x axis is the electric field zero? Determine the x-coordinate(s) of the point(s). At what point(s) along the x axis is the potential zero? Determine the x-coordinate(s) of the point(s). Express your answer using two significant figures. If there is more than one answer, enter your answers in ascending order separated by commas