Three point charges, +6.0 μC, +2.2 μC, and −3.9 μC, lie along the x-axis at 0 cm, 2.7 cm, and 5.0 cm, respectively.
What is the force exerted on q1 by the other two charges? (To the right is positive.) The Coulomb constant is 8.99 × 109 N · m^2/C^2.
Answer in units of N.