3. A charge of +80 uC is placed on the x axis at x = 0. A second charge of -50 #C is placed on the a axis at x = 50 em. What is the magnitude of the electrostatic force on a third charge of 4.0 aC placed on the x axis at x = 30 cm? 4. Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 uC at x = 0, +20 /C atx = 40 cm, and -60 aC at x = 60 cm, what is the magnitude of the electrostatic force on the +32-MC charge