A particle with charge 7 µC is located on the x-axis at thepoint −4 cm , and a second particle with charge 4 µC is placed onthe x-axis at 8 cm . What is the magnitude of the totalelectrostatic force on a third particle with charge −4 µC placed onthe x-axis at 2 cm ? The Coulomb constant is 8.9875 × 109 N · m2 /C2 . Answer in units of N.
