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File:VFPt Solenoid correct2.svg

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Original file(SVG file, nominally 490 × 200 pixels, file size: 15 KB)


English: Diagram of a solenoid and its magnetic field lines. The shape of all lines was computed according to the laws of electrodynamics.
Source Own work
Author Geek3
Other versions
SVG developmentW3C grn.svg The source code of this SVG is valid.VectorFieldPlot symbol.svg This plot was created with VectorFieldPlot.


VectorFieldPlot source code
# paste this code at the end of VectorFieldPlot 3.3
doc = FieldplotDocument('VFPt_Solenoid_correct2',
    width=490, height=200, unit=100, commons=True, bg_color=None)
doc.arrow_geo = {'x_nock':-2, 'x_head':4, 'x_tail':-2, 'width':4}
R = 0.49
L = 1.96
field = Field([ ['coil', {'x':0, 'y':0, 'phi':0, 'R':R, 'Lhalf':L/2, 'I':1}] ])

for a in [-0.455, -0.385, -0.275, -0.165, -0.055, 0.055, 0.165, 0.275, 0.385, 0.455]:
    line = FieldLine(field, [0, a], directions='both', maxr=3.5)
    doc.draw_line(line, linewidth=1.0, arrows_style={'dist':1.5,
        'min_arrows':1, 'max_arrows':3, 'scale':2,
        'offsets':{'start':1, 'leave_image':0.25, 'enter_image':0.25, 'end':1} })

current_out = doc.draw_object('g', {'id':'current_out'}, group=doc._get_defs())
doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':12.5, 'fill':'#ffffff',
    'stroke':'#000000', 'stroke-width':3}, group=current_out)
doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':2.6, 'fill':'#000000',
    'stroke':'none'}, group=current_out)
current_in = doc.draw_object('g', {'id':'current_in'}, group=doc._get_defs())
doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':12.5, 'fill':'#ffffff',
    'stroke':'#000000', 'stroke-width':3}, group=current_in)
doc.draw_object('path', {'d':"M -8.8,-8.8 L 8.8,8.8 M -8.8,8.8 L 8.8,-8.8",
    'fill':'none', 'stroke':'#000000', 'stroke-width':3}, group=current_in)
for x in sc.linspace(-0.84, 0.84, 7):
    doc.draw_object('use', {'{}href':'#current_out',
        'transform':"translate({:.3f},{:.3f}) scale(0.01, 0.01)".format(x, R)})
    doc.draw_object('use', {'{}href':'#current_in',
        'transform':"translate({:.3f},{:.3f}) scale(0.01, 0.01)".format(x, -R)})



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Magnetic field lines in solenoid

Items portrayed in this file


June 2010

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current20:29, 14 September 2019Thumbnail for version as of 20:29, 14 September 2019490 × 200 (15 KB)Geek3validator fix
17:15, 12 June 2010Thumbnail for version as of 17:15, 12 June 2010490 × 200 (15 KB)Geek3VFPt_Solenoid_correct2

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