new file: archive/24-25-2-电磁场与微波-题图5.tex

Author: cppHusky

archive/24-25-2-电磁场与微波-题图5.tex

@@ -0,0 +1,15 @@
+\documentclass{standalone}
+\usepackage{preset}
+\begin{document}
+\begin{tikzpicture}[background rectangle/.style={fill=white},show background rectangle,x=20mm,y=20mm]
+	\draw(-2,0)--(2,0);
+	\draw(0,0)node[below]{\(O\)}circle(1);
+	\node at(1,.5){\(q\)};
+	\draw[->](0,0)--node[right]{\(a\)}(120:1);
+	\node at(-2,.4){\(\varepsilon_1\)};
+	\node at(-2,-.4){\(\varepsilon_2\)};
+	\foreach \x in {-1.8,-1.6,-1.4,-1.2,1.4,1.6,1.8,2}{
+		\draw(\x,0)--({\x-.1},-.1);
+	}
+\end{tikzpicture}
+\end{document}