f= -31.35

+4.44 x 10-6 C
+91
Find the net force on q₁.
+7.28 x 10-6 C
92
0.100 m
+
0.100 m-
F₂ = force exerted on q₁ by q2
-
F3 = force exerted on q₁ by 93
+2.25 x 10-6 C
+93
[7 = [ ? ] N
F₂ = -29.1 N F3 = -2.25 N
Remember: Forces pointing left are negative (-);
forces pointing right are positive (+).