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File:VFPt charges plus minus potential contour.svg

Original file (SVG file, nominally 800 × 600 pixels, file size: 110 KB)

Summary

Description
English: Field of a positive and a negative point charge with finite distance, constituting a finite-sized dipole. The shape of the field lines is accurately computed. The density of lines is a compromise to approximate the field strength close to the charges and far away, which cannot be exactly achieved with a fixed set of lines. The electric potential is shown by the background color, where yellow is neutral, together with uniformely spaced equipotential lines.
Date
Source Own work
Author Geek3
Other versions VFPt charges plus minus.svg
SVG development
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This plot was created with VectorFieldPlot.
Source code
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Python code

VectorFieldPlot source 
# paste this code at the end of VectorFieldPlot 2.4
doc = FieldplotDocument('VFPt_charges_plus_minus_potential contour', commons=True)
field = Field({'monopoles':[[-1,0,1], [1,0,-1]]})
doc.draw_charges(field)
n = 16
for i in range(n):
    a = (0.5   i) / n
    a = 2.0 * pi * a
    line = FieldLine(field, [-1,0], start_v=[cos(a), sin(a)],
        directions='forward')
    doc.draw_line(line, arrows_style={'dist':1.6, 'min_arrows':1,
        'fixed_ends':[True, False, False, True]})

print 'computing contours'
U0 = field.V(sc.array([-1.14, 0.]))
doc.draw_contours(func=field.V, levels=sc.linspace(-U0, U0, 21),
    linewidth=1.0, linecolor='#555555')

print 'computing potential field'
U1 = 0.47
doc.draw_scalar_field(func=field.V, cmap=doc.cmap_AqYlFs, vmin=-U1, vmax=U1)

doc.write()

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dipole

inception

9 October 2019

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Date/TimeThumbnailDimensionsUserComment
current19:55, 9 October 2019Thumbnail for version as of 19:55, 9 October 2019800 × 600 (110 KB)Geek3User created page with UploadWizard

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