File:VFPt superconductor ball B-field.svg

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Original file (SVG file, nominally 600 × 600 pixels, file size: 21 KB)

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Summary

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Description
English: Deformation of a previously homogeneous magnetic field around a superconducting ball.
The magnetic field is ejected by the superconductor (Meissner effect).
Date
Source Own work
Author Geek3
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SVG development
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This plot was created with VectorFieldPlot.
Source code
InfoField

Python code

# paste this code at the end of VectorFieldPlot 1.1
doc = FieldplotDocument('VFPt_superconductor_ball_B-field', width=600, height=600, commons=True)
field_direction = [0.0, -1.0]
ball_radius = 1.2
field = Field({'homogeneous':[field_direction],
    'dipoles':[[0, 0, -2*pi*ball_radius**3*field_direction[0], -2*pi*ball_radius**3*field_direction[1]]]})
n = 20
for i in range(n):
    a = -3 + 6 * (0.5 + i) / n
    line = FieldLine(field, [a, 6], maxr=12, pass_dipoles=1)
    doc.draw_line(line, arrows_style={'min_arrows':2, 'max_arrows':2, 'offsets':4 * [0.3]})
# draw the superconducting ball
ball = doc.draw_object('g', {'id':'metal_ball'})
grad = doc.draw_object('radialGradient', {'id':'metal_spot', 'cx':'0.53', 'cy':'0.54',
    'r':'0.55', 'fx':'0.65', 'fy':'0.7', 'gradientUnits':'objectBoundingBox'}, group=ball)
for col, of in (('#fff', 0), ('#e7e7e7', 0.15), ('#ddd', 0.25), ('#aaa', 0.7), ('#888', 0.9), ('#666', 1)):
    doc.draw_object('stop', {'offset':of, 'stop-color':col}, group=grad)
doc.draw_object('circle', {'cx':0, 'cy':0, 'r':str(ball_radius),
    'style':'fill:url(#metal_spot); stroke:#000; stroke-width:0.02'}, group=ball)
doc.write()

Licensing

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I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head 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.
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 3.0 Unported 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.
You may select the license of your choice.

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Date/TimeThumbnailDimensionsUserComment
current13:39, 24 July 2010Thumbnail for version as of 13:39, 24 July 2010600 × 600 (21 KB)Geek3 (talk | contribs)VFPt_superconductor_ball_B-field

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