Physics

Problem

Four identical positive point charges, each of magnitude

q

, are fixed at the corners of a square of side

a

. A positive test charge

q_0

is placed exactly at the center of the square. Which of the following best describes the net electric force acting on the test charge? a)

\text{The net force has a non-zero magnitude and points along a diagonal toward one of the corners of the square.}

\text{The net force is zero.}

\text{The net force has a non-zero magnitude and is directed perpendicular to the plane of the square.}

\text{The net force has a non-zero magnitude and points toward the midpoint of one of the square's sides.}