我想在我的一份报告中画出这个。但我不知道该怎么做。
答案1
我向您捐赠使用我之前评论中指出的 Mathcha 统一充电的戒指。
\documentclass[a4paper,12pt]{article}
\usepackage{newtxtext,newtxmath}
\usepackage{tikz}
\begin{document}
\begin{figure}[h]
\centering
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\begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
%uncomment if require: \path (0,444); %set diagram left start at 0, and has height of 444
%Shape: Arc [id:dp796341774674139]
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%Shape: Arc [id:dp46939057871839585]
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%Straight Lines [id:da24228394907316253]
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%Shape: Donut [id:dp6846402688267834]
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% Text Node
\draw (229,122) node [anchor=north west][inner sep=0.75pt] {$r$};
% Text Node
\draw (99,101.73) node [anchor=north west][inner sep=0.75pt] {$R$};
% Text Node
\draw (164,91.73) node [anchor=north west][inner sep=0.75pt] {$dq_{2}$};
% Text Node
\draw (97,215.73) node [anchor=north west][inner sep=0.75pt] {$dq_{1}$};
% Text Node
\draw (219,174) node [anchor=north west][inner sep=0.75pt] {$x$};
% Text Node
\draw (454,169.73) node [anchor=north west][inner sep=0.75pt] {$x$};
% Text Node
\draw (126,19.73) node [anchor=north west][inner sep=0.75pt] {$y$};
% Text Node
\draw (40,232.73) node [anchor=north west][inner sep=0.75pt] {$z$};
% Text Node
\draw (281,134.73) node [anchor=north west][inner sep=0.75pt] {$P( x,0,0)$};
% Text Node
\draw (243,145.73) node [anchor=north west][inner sep=0.75pt] {$\theta$};
% Text Node
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% Text Node
\draw (343,187.73) node [anchor=north west][inner sep=0.75pt] {$d\vec{\mathbf E}_{2}$};
% Text Node
\draw (365,115.73) node [anchor=north west][inner sep=0.75pt] {$d\vec{\mathbf E}_{1}$};
% Text Node
\draw (417,140.73) node [anchor=north west][inner sep=0.75pt] {$d\vec{\mathbf E}_{x}$};
\end{tikzpicture}
\caption{Ring uniformly charged.}
\end{figure}
\end{document}