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File:VFPt cylindermagnet field-representations.svg

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Original file (SVG file, nominally 1,860 × 620 pixels, file size: 296 KB)

Summary

Description
English: Three different representations of the magnetic field of a cylindrical bar magnet. Left: Iron filings. Center: field lines. Right: compass needles. The shape and direction of the field was accurately computed in all three cases.
Date
Source Own work
This file was derived from: Ironfilings cylindermagnet.svg
This file was derived from: Magnet compasses.svg
Author Geek3
SVG development
InfoField
 
The SVG code is valid.
 
This plot was created with VectorFieldPlot.
 
This file uses embedded text.

Quality image

This image has been assessed using the Quality image guidelines and is considered a Quality image.

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Source code
InfoField

Python code

# paste this code at the end of VectorFieldPlot 2.5
# https://commons.wikimedia.org/wiki/User:Geek3/VectorFieldPlot
doc = FieldplotDocument('VFPt_cylindermagnet_field-representations', commons=True,
    width=600, height=600)

R = 0.6
Lhalf = 1.0
field = Field([['coil', {'x':0, 'y':0, 'phi':pi/2, 'R':R, 'Lhalf':Lhalf, 'I':1}]])
doc.draw_magnets(field)

n = 26
for i in range(n):
    a = R * (-1 + 2. * (0.5 + i) / n)
    line = FieldLine(field, [a, 0.], directions='both', maxr=5.0)
    def arrow_pot(xy):
        return (((xy[0]/(2.5*R))**2+(((xy[1]-Lhalf)/(2*R))**2)-1) *
            ((xy[0]/(2.5*R))**2+(((xy[1]+Lhalf)/(2*R))**2)-1))
    if i in [0, n-1]:
        arrow_pot = lambda xy: xy[1]
    doc.draw_line(line, arrows_style={'scale':1.3,
        'at_potentials':[0.], 'potential':arrow_pot,
        'condition_func':lambda xy: fabs(xy[0])>R or fabs(xy[1])>Lhalf})

doc.write()

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
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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.

Captions

Three different magnetic field representations of a cylinder magnet

Items portrayed in this file

depicts

magnetic field

bar magnet

inception

24 March 2020

media type

image/svg+xml

File history

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Date/TimeThumbnailDimensionsUserComment
current18:57, 24 March 2020Thumbnail for version as of 18:57, 24 March 20201,860 × 620 (296 KB)Geek3Uploaded own work with UploadWizard

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