File:VFPt superconductor ball B-field.svg
![File:VFPt superconductor ball B-field.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/VFPt_superconductor_ball_B-field.svg/600px-VFPt_superconductor_ball_B-field.svg.png?20100724133951)
Original file (SVG file, nominally 600 × 600 pixels, file size: 21 KB)
Captions
Captions
Summary
[edit]DescriptionVFPt superconductor ball B-field.svg |
English: Deformation of a previously homogeneous magnetic field around a superconducting ball. The magnetic field is ejected by the superconductor (Meissner effect). |
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Date | |||||
Source | Own work | ||||
Author | Geek3 | ||||
Other versions |
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SVG development InfoField | ![]() 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()
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Licensing
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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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:39, 24 July 2010 | ![]() | 600 × 600 (21 KB) | Geek3 (talk | contribs) | VFPt_superconductor_ball_B-field |
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Short title | VFPt_superconductor_ball_B-field |
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Image title | VFPt_superconductor_ball_B-field
created with VectorFieldPlot 1.1 http://commons.wikimedia.org/wiki/User:Geek3/VectorFieldPlot about: http://commons.wikimedia.org/wiki/File:VFPt_superconductor_ball_B-field.svg rights: GNU Free Documentation license, Creative Commons Attribution ShareAlike license |