# [pstricks] Re : Re : about pst-electricfield

Manuel Luque mluque5130 at aol.com
Tue Feb 22 18:14:58 CET 2011

Dear Kari,

The result is perfect. Effectively, the parameter "N" (the number of  field lines) can be used to obtain the best symmetry.

Best wishes

manuel

-----E-mail d'origine-----
De : Kari Eloranta <kari.eloranta at me.com>
A : pstricks at tug.org
Envoyé le : Dimanche, 20 Février 2011 7:34
Sujet : [pstricks] Re : about pst-electricfield

Dear Manuel,
Thank you very, very much. I was only hoping my problem would be solved. I am writing material for my students, and now I am able to send them the text tomorrow. What a beautiful way to start a sunny Sunday morning :-)
I modified the suggested code a bit to maintain symmetry (changed 16 to 15 in \psElectricfield).

\begin{center}

\begin{pspicture*}(-4,-4)(4,4)

\psframe*[linecolor=green!20](-4,-4)(4,4)

\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]

\rput{90}(0,0){\psElectricfield[Q={[2 0 2 15][2 0 -2 15]}]}

\rput[0](-2,0){\large{$+$}}

\rput[0](2,0){\large{$+$}}

\end{pspicture*}

\end{center}
Best regards,
Kari

Dear Kari,

Try with this code :

\documentclass{article}

\usepackage{pst-electricfield}

\begin{document}

\begin{center}

\begin{pspicture*}(-4,-4)(4,4)

\psframe*[linecolor=green!20](-4,-4)(4,4)

\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]

\rput{90}(0,0){\psElectricfield[Q={[2 0 2 16][2 0 -2 16]}]}

\rput[0](-2,0){\large{$+$}}

\rput[0](2,0){\large{$+$}}

\end{pspicture*}

\end{center}

\end{document}

Best regards,

M.L.

-----E-mail d'origine-----

De : Kari Eloranta <kari.eloranta at me.com>

A : pstricks at tug.org

Envoyé le : Samedi, 19 Février 2011 15:25

I have used the pst-electricfield package to draw the field of two positive point charges. However, the code below produces

a line connecting the two charges. I do not think that it should be like that, but more like in http://dev.physicslab.org/Document.aspx?doctype=3&filename=Electrostatics_PointChargesElectricFields.xml.

Am I mistaken? If I am not, is there a way of correcting it?

Best regards,

Kari

\begin{center}

\begin{pspicture*}(-4,-3)(4,3)

\psframe*[linecolor=green!20](-4,-3)(4,3)

\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]

\psElectricfield[Q={[2 -2 0][2 2 0]}]

\rput[0](-2,0){\large{$+$}} \rput[0](2,0){\large{$+$}}

\end{pspicture*}\label{fig:twoEqPointCharges}\caption{The electric field of two equal positive point charges.}

\end{center}

***************************************

Kari Eloranta

Ketunpolku 1

40400 Jyväskylä

Puh: +358 40 586 7654

***************************************
Kari Eloranta
Ketunpolku 1
40400 Jyväskylä
Puh: +358 40 586 7654

=

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