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\documentclass[tikz]{standalone}
\usepackage{amsmath}
\usepackage{times}
\usepackage{txfonts}
\usetikzlibrary{arrows}
\usetikzlibrary{intersections}
\usetikzlibrary{math}
\usetikzlibrary{positioning}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{shapes.misc}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[
>=latex,
node distance = 2mm,
charge/.style = {
circle, draw = black, thick,
minimum size = 5mm
},
positive/.style = { fill = red!50 },
negative/.style = { fill = blue!50 },
]
\matrix[nodes = { charge }, row sep = 8mm, column sep = 8mm] {
\node[positive] {}; & \node[negative] (N) {}; & \node [positive] {}; \\
\node[negative] (W) {}; & \node[positive] {}; & \node [negative] (E) {}; \\
\node[positive] {}; & \node[negative] (S) {}; & \node [positive] {}; \\
};
\draw[gray, dashed] (W) to (N) to (E) to (S) to (W);
\end{tikzpicture}
\end{document}
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