Two Particles, Each with Charge Q, and a Third Particle

Multiple Choice

Two particles, each with charge Q, and a third particle, with a charge q, are placed at the vertices of an equilateral triangle as shown. The total force on the particle with charge q is:

A) Parallel to the left side of the triangle
B) Parallel to the right side of the triangle
C) Parallel to the bottom side of the triangle
D) perpendicular to the bottom side of the triangle
E) perpendicular to the left side of the triangle