(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in Figure P15.10. N/C 6.00 1.50 C -2.00 3.00 cm -2.00 cm- Figure P15.10 (b) If a charge of -3.10 C is placed at this point, what are the magnitude and direction of the force on it? Magnitude NDirection toward the left toward the right