Four identical point charges are placed at the corners of a square of side

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

Problem

d

. Three of the charges are

+Q

and the fourth is

-Q

. A small positive test charge is placed at the center of the square. Describe the direction of the net electrostatic force on the test charge.