What is the answer? Pleasee!!!

Question

A particle with charge −7 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 .

−10−8−6−4−2

2 4 6 8 10 x→ (cm)

What is the magnitude of the total elec- trostatic force on a third particle with charge −8 μC placed on the x-axis at 2 cm? The Coulomb constant is 8.9875 × 109 N · m2/C2.

Answer 1

The total electrostatic force on a particle is the vector sum of the forces from other particles. In this case, the third particle is placed in line with the other two. They all have negative charge, and therefor a repulsive force between each pair. The net force on the third particle is the difference between the forces 1--->3 and 2--->3