A particle with charge 4 uC is located on the x-axis at the point 8 cm; and a second particle with charge 8 uC is placed on the x-axis at 4 cm: What is the magnitude of the total electrostatic force on a third particle with charge 9 uC placed on the x-axis at 2 cm? The Coulomb constant is 8:9875 109 Nm2=C2. Answer in units of N.