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Summary
| Description |
English: Drawing of four homogeneously magnetized cylindrical magnets of different aspect ratios with exactly computed magnetic field lines. The magnetic north poles are aligned on top and the magnetic south poles on the bottom, with magnetization along the cylinder axes. The cylinder dimensions are:
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| Date | |
| Source | Own work |
| Author | Geek3 |
| SVG development |  This plot was created with VectorFieldPlot. |
| Source code | Python code# paste this code at the end of VectorFieldPlot 2.4
RL = [ [0.1, 1.], [0.4, 0.7], [0.7, 0.4], [1.0, 0.1] ]
for i, (R, L) in enumerate(RL):
doc = FieldplotDocument('VFPt_four_magnets' + str(i+1), commons=True,
width=380, height=380)
field = Field([ ['coil', {'x':0, 'y':0, 'phi':pi/2,
'R':R, 'Lhalf':L, 'I':2.*L}] ])
field_pot = Field([
['charged_disc', {'x0':-R, 'x1':R, 'y0':L, 'y1':L, 'Q':pi*R**2}],
['charged_disc', {'x0':-R, 'x1':R, 'y0':-L, 'y1':-L, 'Q':-pi*R**2}] ])
nlines = 11
V0 = field_pot.V([0., 1.9 * 0.6 + 0.4 * L])
for iline in range(nlines):
p0 = sc.array([R * (2. * (iline + 0.5) / nlines - 1.), 0.])
line = FieldLine(field, p0, directions='both', maxr=100)
arrow_potentials = [0.]
if iline > 0 and iline < nlines -1:
arrow_potentials += [-V0, V0]
doc.draw_line(line, maxdist=1,
arrows_style={'at_potentials':arrow_potentials,
'potential':field_pot.V,
'condition_func':lambda xy: fabs(xy[0])>R or fabs(xy[1])>L})
doc.draw_magnets(field)
doc.draw_object('rect', {'x':'-1.9', 'y':'-1.9', 'width':'3.8',
'height':'3.8', 'style':'fill:none; stroke:#aaaaaa; stroke-width:0.03;'})
doc.write()
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Licensing
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- Under the following conditions:
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- 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.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:09, 1 November 2019 | 800 × 800 (77 KB) | Geek3 | User created page with UploadWizard |
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