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\documentclass[a4paper]{article}

\usepackage{pstricks}
\usepackage{pst-node}
\usepackage{pst-coil}

\pagestyle{empty}

\begin{document}

\SpecialCoor
\begin{pspicture}(-2,-2)(2,2)
  \pscircle{2}
  \pnode(2;-90){O}
  \pnode(2;10){A}\pnode(2;60){B}
  \pnode(2;190){C}\pnode(2;-60){D}
  \qdisk(A){3pt}\qdisk(B){3pt}
  \qdisk(C){3pt}\qdisk(D){3pt}
  \nccoil[coilarm=3mm,coilwidth=3mm,linecolor=red]{-}{O}{A}%
  \nccoil[coilarm=3mm,coilwidth=3mm,coilheight=1.4,linecolor=red]{-}{O}{B}%
  \nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.9,linecolor=red]{-}{O}{C}%
  \nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.5,linecolor=red]{-}{O}{D}%
  \rput(1.6,-.4){$m$}
  \rput(.8,-1){$k$}
  \psline[linecolor=blue,linewidth=1.5pt]{<-}(-2,0)(0,0)
  \rput(-1,.2){$r$}
\end{pspicture}


\end{document}