VFPt_charges_plus_minus_potential+contour.svg

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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The SVG code is valid .
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()

Licensing

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Captions

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Items portrayed in this file

depicts

dipole

inception

9 October 2019

media type

image/svg+xml