A point charge is placed at the centroid of an equilateral triangle

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential

Problem

A point charge

+Q

is placed at the centroid of an equilateral triangle. When a second charge

+Q

is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central charge is

8\,\text{N}

. The magnitude of the net force on the central charge when a third charge

+Q

is placed at another vertex of the triangle is (1) zero (2)

4\,\text{N}

(3)

4\sqrt{2}\,\text{N}

(4)

8\,\text{N}