Question

A particle with charge −9 µC is located on
the x-axis at the point 6 cm , and a second
particle with charge 9 µC is placed on the
x-axis at 4 cm .
What is the magnitude of the total electrostatic force on a third particle with charge
2 µC placed on the x-axis at −2 cm ? The
Coulomb constant is (8.9875 × 10^9)N · m2/C^2
.
Answer in units of N