File:VFPt rotating-charged-sphere-approx-(rings,7-wires).svg

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Original file ‎(SVG file, nominally 600 × 600 pixels, file size: 79 KB)

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Summary[edit]

Description
English: appoximate magnetic field of a rotating charged sphere (7 ringcurrents; current decreases with cos() to the poles)
Date
Source Own work
Author MikeRun
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SVG development
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This plot was created with VectorFieldPlot.
Source code
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Python code

# paste this code at the end of VectorFieldPlot 3.0
import math

doc = FieldplotDocument('VFPt_rotating-charged-sphere-approx-(7-wires)',  width=600, height=600, commons=True)
additional_wires_per_hemisphere = 3
total_wires = 2*additional_wires_per_hemisphere+1
sphere_radius = 1
current_max = 1
currents = [[0,0,0,sphere_radius,current_max]]
phi = math.pi/(2*total_wires)
for i in range(additional_wires_per_hemisphere):
    for j in [-1,1]:
        currents.append([j*math.sin((2*(i+1))*phi)*sphere_radius,0,0,math.cos((2*(i+1))*phi)*sphere_radius,math.cos((2*(i+1))*phi)*current_max])
field = Field({'ringcurrents':currents})
for x0, y0, off in [[-0.3719,-1.2553,0], [0.3719,-1.2553,0],
    [0.,-0.9802,0], [0.,-0.7820,0], [0.,-0.6297,.5], [0.,-0.4882,.5],
    [0.,-0.3490,.5], [0.,-0.2098,.5], [0.,-0.0700,.5], [0.,0.0700,.5],
    [0.,0.2098,.5], [0.,0.3490,.5], [0.,0.4882,.5], [0.,0.6297,.5],
    [0.,0.7820,0], [0.,0.9802,0], [-0.3719,1.2553,0], [0.3719,1.2553,0]]:
    line = FieldLine(field, [x0, y0], directions='both', maxr=5)
    doc.draw_line(line, arrows_style={'dist':2,
        'min_arrows':1, 'max_arrows':4, 'offsets':[off,0.5,0.5,1.0-off]})
doc.draw_currents(field)
doc.write()

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International 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.

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Date/TimeThumbnailDimensionsUserComment
current11:09, 2 April 2021Thumbnail for version as of 11:09, 2 April 2021600 × 600 (79 KB)MikeRun (talk | contribs)Uploaded own work with UploadWizard

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