A particle with charge 9 C is located on the x-axis at the point 10 cm , and a second particle with charge 9 C is placed on the x-axis at 10 cm.

A particle with charge −9 µC is located on the x-axis at the point −10 cm , and a second particle with charge 9 µC is placed on the x-axis at 10 cm. What is the magnitude of the total electrostatic force on a third particle with charge 9 µC placed on the x-axis at 2 cm ? The Coulomb constant is 8.9875 × 109 N · m 2 /C 2 . Answer in units of N.