Исходники иллюстрации

\documentclass[tikz]{standalone}\input{pre.tex}\begin{document}\begin{tikzpicture}
        % \draw (0,0) node[left]{$\phi_0$} circle (1cm)
        %     circle (2cm);
        % \draw[fill=black] (0,0) circle (2pt);
        % \draw[axis,->] (0,0) -- (3,0) node[right] {$+r$};
        % %
        % \lineann[4]{90}{2}{$R_2$};
        % \lineann[3]{90}{1}{$R_1$};
        \fill[magenta!10] (0,0) circle (2);
        \fill[white] (0,0) circle (1.75);
        \draw[black,thick] (0,0) circle (2);
        \foreach \i in {1.75,2}{
            \draw[black!50] (0,0) circle (\i);
        };
        \foreach \angle in {0,10,...,360}{
            \draw[black,thick] (0,0) ++ (\angle:1.75) -- ++ (\angle:0.25);
        };

        \draw[thick] (3,0) ++ (0,-2) rectangle ++(0.1,4);
        \draw[dashed, blue,->] (3,0) -- (8,0) node[thick,right] {$+x$};

        \draw[axis] (3,2) -- (7,0) circle (2pt);
        \begin{scope}[xshift=3cm]
            % \lineann[0.5]{90}{1.3}{$h$};
            \lineann[1]{90}{2}{$R$};
        \end{scope}
        \begin{scope}[xshift=3cm, yshift=2cm]
            \lineann[1]{-28}{4.5}{$r$};
        \end{scope}
        \begin{scope}[xshift=3cm, yshift=0cm]
            \lineann[-1]{0}{4}{$x$};
        \end{scope}
    
\end{tikzpicture}\end{document}