A Point Charge Q Is Placed at the Origin

Multiple Choice

A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = −3.0 m. If Q = 50 μC, what is the magnitude of the electrostatic force on a third point charge, −Q, placed on the y axis at y = +4.0 m?

A) 2.5 N
B) 3.0 N
C) 3.7 N
D) 4.4 N
E) 1.8 N