File:VFPt charges plus minus thumb potential.svg

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Original file ‎(SVG file, nominally 220 × 165 pixels, file size: 31 KB)

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Summary[edit]

Description
English: Accurately computed electric field of a positive and a negative point charge. Thumbnail version. The electric potential is shown as the background color.
Date
Source Own work
Author Geek3
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SVG development
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This plot was created with VectorFieldPlot.
Source code
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Python code

doc = FieldplotDocument('VFPt_charges_plus_minus_thumb_potential',
    width=220, height=165, unit=30., commons=True)
charges = [{'x':-1, 'y':0, 'Q':1}, {'x':1, 'y':0, 'Q':-1}]
field = Field([ ['monopole', par] for par in charges])
doc.draw_charges(field, scale=11./14.)

# draw potential in background
U0 = field.V(sc.array([-1. - 15./30. * 11./14., 0.]))
doc.draw_scalar_field(func=field.V, cmap=doc.cmap_AqYlFs, vmin=-U0, vmax=U0)

nlines = 16
for iline in range(nlines):
    a = 2.0 * pi * (0.5 + iline) / nlines
    if fabs(iline - (nlines - 1) / 2.) > 6.:
        fix = {'start':False, 'leave_image':False, 'enter_image':False, 'end':False}
    else:
        fix = {'start':True, 'leave_image':False, 'enter_image':False, 'end':True}
    line = FieldLine(field, [-1,0], start_v=[cos(a), sin(a)],
        directions='forward')
    doc.draw_line(line, linewidth=1.0, arrows_style={
        'dist':1.6, 'min_arrows':1, 'fixed_ends':fix, 'scale':1.4,
        'offsets':{'start':0.65, 'leave_image':0.5, 'enter_image':0.5, 'end':0.65} })
doc.write()

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I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
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You are free:
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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.
  • 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.

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Date/TimeThumbnailDimensionsUserComment
current22:37, 7 September 2019Thumbnail for version as of 22:37, 7 September 2019220 × 165 (31 KB)Geek3 (talk | contribs)User created page with UploadWizard

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