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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,
dot/.style = {
draw, circle, thick, black, fill = gray!40!white,
minimum size = 2mm,
inner sep = 0pt,
outer sep = 1mm,
},
]
\node[dot] (A1) at (0,0) {};
\node[below left] at (A1) {\(A\)};
\node[dot] (A2) at (2.5,0) {};
\node[below right] at (A2) {\(A'\)};
\draw[red!80!black, thick, ->]
(A1) to node[midway, below] {\(\vec{Q}\)} (A2);
\node[dot] (B1) at (120:2.5) {};
\node[above left] at (B1) {\(B\)};
\draw[green!70!black, thick, ->]
(A1) ++(.5,0) arc (0:120:.5)
node[midway, above, xshift=1mm] {\(C_n\)};
\draw[red!80!black, dashed, thick, ->] (A1) to (B1);
\node[dot] (B2) at ($(A2)+(60:2.5)$) {};
\node[above right] at (B2) {\(B'\)};
\draw[green!70!black, thick, dashed, ->]
(A2) ++(-.5,0) arc (180:60:.5);
\draw[red!80!black, dashed, thick, ->] (A2) to (B2);
\draw[cyan!40!blue, thick, ->]
(B1) to node[above, midway] {\(\vec{Q}'\)} (B2);
\draw[gray, dashed, thick] (A1) to (A1 |- B1) node (Xl) {};
\draw[gray, dashed, thick] (A2) to (A2 |- B2) node (Xr) {};
\node[above left, xshift=-2mm] at (Xl) {\(x\)};
\node[above right, xshift= 2mm] at (Xr) {\(x\)};
\end{tikzpicture}
\end{document}
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