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<p class="MsoNormal">Dear Herbert,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Here is an example that uses \psRelLine, \psParallelLine, … with the proposed pstricks-add modification.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The vector diagram is automatically adapted when we change the angle of I2 (second line of picture). It could even be animated by using animate package.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">\documentclass{article}<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">\usepackage{pstricks-add}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\listfiles<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\newcommand{\pmsc}[1]{\ensuremath{\underline{#1}}}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\newcommand{\pmIc}{\pmsc{I}}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\newcommand{\pmUc}{\pmsc{U}}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\newcommand{\pmEc}{\pmsc{E}}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\begin{document}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\begin{pspicture}[showgrid=true](-5,-5)(5,8)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psStartPoint[I](0,0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psVector[linewidth=1.5pt,linecolor=red](1.5;235)\ncput*{$\pmIc_2$}%I_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psStartPoint[U](0,0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psVector[linewidth=1.5pt](2;90)\ncput*{$\pmUc_2$}%U_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psParallelLine[linewidth=1.5pt,arrows=->](0,0)(I1)(U1){-0.3}{NUa}\nbput{\tiny $-R_2\pmIc_2$}%-R_2.I_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psRelLine[linewidth=1.5pt,arrows=->,angle=90](NUa)(U1){-5}{NUb}\nbput{\tiny $-j\omega L_{\sigma2}\pmIc_2$}%-j\omega I_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\pcline[linewidth=3.5pt,arrows=->](0,0)(NUb)\naput{$\pmEc_2$}%E_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psParallelLine[linewidth=1.5pt,arrows=->,linecolor=blue](0,0)(NUb)(0,0){1.428}{NUc}\nbput[npos=0.8]{$\pmEc_1$}%E_1 (m=0.7)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psRelLine[linewidth=1.5pt,arrows=->,angle=-85,linecolor=orange](0,0)(NUc){0.2}{NIm1}\nbput{\tiny $\pmIc_{m1}$}%I_m1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psParallelLine[linewidth=1.5pt,arrows=->,linecolor=orange](0,0)(I1)(NIm1){-0.7}{NI1}\nbput{\tiny $-m\pmIc_2$}%m.I_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\pcline[linewidth=1.5pt,arrows=->,linecolor=orange](0,0)(NI1)\naput{\tiny $\pmIc_{1}$}%I_1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psParallelLine[linewidth=1.5pt,arrows=->,linecolor=blue](0,0)(NI1)(NUc){0.2}{NUd}\nbput{\tiny $R_1\pmIc_1$}%R_1 I_1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\psRelLine[linewidth=1.5pt,arrows=->,angle=90,linecolor=blue](NUd)(NUc){-5}{NUe}\nbput{\tiny $j\omega L_{\sigma1}\pmIc_1$}%-j\omega I_2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\pcline[linewidth=1.5pt,arrows=->,linecolor=blue](0,0)(NUe)\naput{$\pmUc_{1}$}%I_1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">\end{pspicture}<o:p></o:p></span></p>
<p class="MsoNormal">\end{document}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal">Patrice<o:p></o:p></p>
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