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File:VFPt four charges.svg

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Original file (SVG file, nominally 600 × 600 pixels, file size: 28 KB)

Summary

Description
English: Field of two positive and two negative point charges constituting a non-ideal electric quadrupole.
Date
Source Own work
Author Geek3
SVG development
InfoField
 
The SVG code is valid.
 
This plot was created with VectorFieldPlot.
Source code
InfoField

Python code

# paste this code at the end of VectorFieldPlot 1.0
doc = FieldplotDocument('VFPt_four_charges', width=600, height=600, commons=True)
field = Field({'monopoles':[[-1,0,-1], [0,1,1], [1,0,-1], [0,-1,1]]})
doc.draw_charges(field)
n = 8
Fsum = ig.quad(lambda t: sc.dot(field.F([.5*sin(t), 1-0.5*cos(t)]),
    [sin(t), -cos(t)]), 0, pi)[0]
for i in range(n):
    a = (i + 0.5) / n
    w = op.brentq(lambda w: ig.quad(lambda t: sc.dot(field.F([0.5*sin(t),
    	1-0.5*cos(t)]), [sin(t), -cos(t)]), 0, w)[0] - a * Fsum, 0, pi)
    for w1 in range(4):
    	line = FieldLine(field, rot([.5*sin(w), 1.0-0.5*cos(w)], w1 * pi/2),
    	    directions='both')
    	doc.draw_line(line, arrows_style={'dist':1.5})
doc.write()

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.

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inception

May 2010

media type

image/svg+xml

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Date/TimeThumbnailDimensionsUserComment
current14:24, 29 April 2017Thumbnail for version as of 14:24, 29 April 2017600 × 600 (28 KB)Geek3validator fix
21:44, 31 May 2010Thumbnail for version as of 21:44, 31 May 2010600 × 600 (28 KB)Geek3VFPt_four_charges

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