File:VFPt four charges.svg
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Original file (SVG file, nominally 600 × 600 pixels, file size: 28 KB)
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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 |  This plot was created with VectorFieldPlot. |
| Source code | 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:
|
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. |
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
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- 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.
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:24, 29 April 2017 | | 600 × 600 (28 KB) | Geek3 | validator fix |
| 21:44, 31 May 2010 |  | 600 × 600 (28 KB) | Geek3 | VFPt_four_charges |
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