File:VFPt rotating-charged-sphere-approx-(7-wires)-180.svg
Summary
{{Information
|description=
English: appoximate magnetic field of a rotating charged sphere (7 ringcurrents; current decreases with cos() to the poles)
|date=2021-04-02
|source=Own work
|author=MikeRun
|permission=
|other versions=
-180.svg)
.svg)
.svg)
|other fields={{Igen|VectorFieldPlot|+|c1=
- paste this code at the end of VectorFieldPlot 3.0
import math
doc = FieldplotDocument('VFPt_rotating-charged-sphere-approx-(7-wires)', width=600, height=600, commons=True) additional_wires_per_hemisphere = 3 total_wires = 2*additional_wires_per_hemisphere+1 sphere_radius = 1 current_max = 1 currents = 0,0,0,sphere_radius,current_max phi = math.pi/(2*total_wires) for i in range(additional_wires_per_hemisphere):
for j in [-1,1]:
currents.append([j*math.sin((2*(i+1))*phi)*sphere_radius,0,0,math.cos((2*(i+1))*phi)*sphere_radius,math.cos((2*(i+1))*phi)*current_max])
field = Field({'ringcurrents':currents}) for x0, y0, off in [[-0.3719,-1.2553,0], [0.3719,-1.2553,0],
[0.,-0.9802,0], [0.,-0.7820,0], [0.,-0.6297,.5], [0.,-0.4882,.5],
[0.,-0.3490,.5], [0.,-0.2098,.5], [0.,-0.0700,.5], [0.,0.0700,.5],
[0.,0.2098,.5], [0.,0.3490,.5], [0.,0.4882,.5], [0.,0.6297,.5],
[0.,0.7820,0], [0.,0.9802,0], [-0.3719,1.2553,0], [0.3719,1.2553,0]]:
line = FieldLine(field, [x0, y0], directions='both', maxr=5)
doc.draw_line(line, arrows_style={'dist':2,
'min_arrows':1, 'max_arrows':4, 'offsets':[off,0.5,0.5,1.0-off]})
doc.draw_currents(field) doc.write() }} }}
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-180.svg){kind=link}